Did okay about a year ago, sold about 11 quite rare LPs, made £450 - correction, turnover was £450, deduct the 10% total (more or less) that Ebay and PayPal took (it's double dipping IMO - same damn company).
Got naffed off with a few people over time, but only blocked around 5 from bidding over the last five years or so. One guy had a right moan that I took an extra day or two to ship an amp out to him. I suggested if he wanted a service like Superfi's or Sevenoaks, that's maybe the place for him to go than having a pop at someone who's a private seller and doesn't have an army of people to call on. Well, an army of one...! He left good feedback in the end, but it soured things a bit. Duly blocked!
One Italian guy took three weeks to pay. This after having stuck in a last second bid, then promptly cleared off. My view is, if you bid in the last second and win, you can damn well cough up within a couple of minutes. He finally paid, I struck him off and he asked why he couldn't bid on another LP I was selling a bit later! Polite but firm email in return effectively explaining it.
Got a few things to sell just now, mostly some CDs/SACDs, but there's no way I'd go down the Ebay selling route full time if I could. Just too much hassle, expense and WAY too many numpties out there!