I've sold lots of pins on ebay, with mixed results. I find that selling individual pins doesn't work too well, so I try to make sets -- either by theme, character or subject -- of 7-10 pins. I try to price them for just about $2 a pin (I know, they really have no value) with a buy it now of a little higher if some of the pins are LE or more valuable. Take pictures of the entire group, and since photos are free on ebay now, don't hesitate to show individual pins in pictures! I also always offer a shipping discount if people buy more than one set and I can ship them together.
I put quite a few sets on ebay a couple of weeks ago -- hubby lost his job, so I wanted to make some extra money for Christmas gifts, and I haven't been overly interested in pin trading for a while -- and sold several groups for a total of about $120, but I had several sets that haven't sold. I'll probably relist those again, but I'm still thinking about it. You certainly won't make back the money you spent, but if you're happy getting SOMETHING for them rather than having them just take up space, you can try it. Good luck!
Erin