Then you haven't spent much time researching completed sales, good bottles sell for good money, turds don't... It's the best way to reach the most people.[8|]
It depends what you are trying to sell. If you are selling bottles worth less than the ten bucks it costs to ship one, then no they are not going to sell on ebay. You would do better taking them to a flea market and trying to sell them to someone who does not know much about bottles.
I sell a lot of low to medium priced bottles on ebay ($10 - $100) and generally they bring more than they would at a bottle show and I don't have to carry them around for years looking for the right person.