Just looking on some of the buy, sell and swap pages on Facebook. There are so many people who sell items for £2. I just don't see the point of going to that hassle for so little money. I sometimes see it in the local paper too, i.e a jigsaw for £3. I would rather give it to a charity shop than sell it for that.
I buy and sell a lot of records (mainly vinyl) and have a general rule of £5 minimum. Anything beneath that represents such little profit that it's almost not worth the bother...
As long as they pay the postage why not ?
I have put things on ebay with a 99p start and only got the 99p, still sent them though. I once bought a camera for 99p on ebay then sold it a few days later for £68 .
I once advertised a moped. It was made clear that it was free, road worthy and 30 odd years old. A guy came to take a look and complained that it was a bit tatty........