i've sold on ebay, and had quite a few problems with people not paying, also with people saying they never got tiems, despite them being sent recorded delivery and being signed ofr.
you jsut have to eb carefull who you sell to.
it can be a bit of work, itisnt always easy. theres the wrapping up of everything, and carting it to the psot office, waiting to get payments etc.
we didnt make much money from it recently, when we did it 4 years ago we made a few hundred, but things seem to have slowed down a lot lately.