you have a lot of market places. But ebay is one of the bigger. You have bonanza, ebid, different country sites too...like in Norway we got qxl.no. Same in denmark qxl.dk. Where u live?
I live in usa and ship only inside the USA , i know that there is a lot of market places , but i want someone that check one of them and can recommend me :)
My theory is, if it's free to list and you have the time to do it, then what have you got to loose by having a presence there, not matter what the traffic flow is like compared to the big markets.