Try doing eBay enmasse.
- One guy got up me when his purchase (sent as two parcels) didn't both arrive on same day
- One guy asks me 6 hours after his purchase why wasn't it posted
- One person got up me about including an invoice with purchase (you are emailed one when you win the auction, derp!)
- A vendor got up me for leaving negative feedback when the item wasn't in stock, and they advertised that they had 6 available
- A guy got upset when I overquoted postage by about 20-80 cents.
But these are the only 4 transactions I have had issues with. Overall I have had good success with eBay.
- A guy bought a pair of cowboy boots for $30. On pickup, he instead offers me a stereo instead of $30 cash, saying it was out of VL Commodore. Turns out it was out of VL Calais and in mint condition. Got $150 for it plus postage 2 hours later.
- A set of 4 golden fleece paper cups I had as part of a period appropriate display for VB Commodore - bought for $15, sold for $131!
Overall I have raised $1150 on eBay over the last couple of months. Used to proceeds to start modding the Mazda3. Still have some items to go, including a vintage portable TV, some VT Commodore handbook wallets, a collection of vintage beer cans and a couple of other bits and pieces. To his date I have sold off my childhood coin collection, some redundant car parts, old maps and books, and other things.