Should I have to give a warranty when selling one of my "old" embroidery machines or is inviting people to see it in action at my home before they place a bid enough?<br /><br /><br /><br />

I have listed one of my embroidery machines for sale with a very low starting bid on a well-known site.<br /><br /><br /><br />
I am just a senior citizen, not a machine dealer and need the funds to make my home more senior citizen-friendly. The machine is a well-known brand and model; it works well and I had been keeping it because it can use a small free-arm hoop - great for getting designs into small things without having to undo seams, etc, but I really can't justify keeping it just for that as I also have another machine which I use more often for bigger things.<br /><br /><br /><br />
A potential bidder has contacted me wanting a warranty - my concern is that I have no control over how this person treats or mistreats my machine after they take possession of it. Surely if they can see it works ok for themselves before they buy it that should be enough.<br /><br /><br /><br />
What do you think?<br /><br />
<br /><br />
Update:<br /><br />
After reading some of your replies but Before I had read all your helpful and caring replies, I refused giving a warranty, explaining why; gave that person the name of a dealer that does good services, recommended some embroidery web sites ( including Cute...) for them to learn more about doing machine embroidery and I had invited that person to visit tomorrow morning for me to show them that it is working ok; they then said they would not come as they were going away this weekend & I wished them well with finding what they want; now that I think about it a bit more, I am relieved that they are not coming and will be much more cautious about inviting strangers to my home.
Update April 10:
My machine listing seems to have attracted more than its share of difficult people.
Someone else ended up placing an uncontested bid for my machine not long before the sale closed and so became the "winning bidder", but made no payment. The next day they sent a message saying they wanted to come that night to pick-up.
I politely advised them that short-notice night-time pick-up was not convenient, but any day between 9am & 5pm at a mutually agreed time to be agreed on in advance and that payment would need to be made before they took the machine etc away, and even offered to bring the machine etc to meet them in the local shopping centre during daylight hours if that suited them.
They then sent another message along with their phone number to say they wanted to test drive before they paid.
I told them, since it was the rules of the listing site that people not bid unless they intended to purchase, I was somewhat puzzled they had placed their bid for something that they had not really decided they wanted to buy and wondered why, if they had any hesitations about buying, they had not asked to see the machine PRIOR to bidding. She still said she wanted to come that night. I explained that I had already packed everything up ready for collection, and as my home was being renovated it was a "no-go" zone for unauthorised folk and I would need to contact the builders to set the machine up outside of the building works during daylight hours in order to comply with Safe Work Australia regulations and public liability risks; I also explained that I would be willing to demonstrate that it stitched ok but was not willing to let a stranger test-drive it for fear of damage to the machine or misadventure to herself; she said ok & she asked if 10 am Tuesday would be ok and I agreed; she then chatted on for some time about how she didn't really expect her bid to be the only one about all the other machines she had previously owned; that she had been off work for over 8 months with a very painful back injury; that she embroidered towels , tea towels & face cloths, which she supplied to two shops and also sold her wares at markets; and claimed she now had a Janome MBX4 which she kept & used on a small bench right beside her washing machine in a small tin shed & that you could put any sort of thread in it, even string and it would sew ok and that she never used hoops - she just sewed; then she said that IF she was happy with what she saw, she could pay by PAY-Pal on her mobile phone and I could check that her payment had gone through on my computer while she was loading the machine; I said I would ask the builders to load it AFTER I confirmed receiving her payment; she then said "OK I'll see you at 11 am tomorrow". (not 10 am that she had asked for at the start of the conversation). I told the painters who were still there what had happened and that I was a little uneasy about all the inconsistencies and odd things this person had said and they told me they would contact the builders and to lock up well that night. The builders must have been a bit concerned, too, because the next morning both the builders team and the painters team and the electricians all turned up on deck even though only the builders were scheduled for that day and a police van went cruising down my street (which I have never seen in the years I have been here).
That person never turned up and later I checked my messages to find one from them saying they had decided not to proceed with their purchase.
I then contacted the selling site to tell them the buyer had changed their mind and that although it was wrong of the buyer to have acted that way, I did not see any point in trying to push someone to buy something they did not want; the staff told me that if I cancelled the sale myself so I could re-list it quickly it would go down as a black mark against me for withdrawing from the sale and that the only way to end it was I had to wait 4 days to lodge a no payment case, then wait another 4 days for the no payment case to close and then I will be able to re-list it for sale.
So, for now, my Janome 350E is still with me.
You might say that it has been an interesting experience; it seems that trying to sell something can sometimes be a little complicated and a case of seller-be-ware.
Would any-one really keep their embroidery machine, especially a Janome MB4 in a tin shed in a damp area right alongside their washing machine?