eBay > 1 Trillion Daily Users
BitMit < 1 Billion Daily Users
There are a ton more sellers and buyers on ebay, naturally prices will be lower as the auction site is congested to hell, bitmit is a relatively new site with a not commonly used currency, which people want a lot of.. the only way you can see BitMit succeed is by using it yourself and by spreading the word as much you can, hopefully all the time and effort people put in to bitcoin will pay off when it becomes and 'accepted' currency but until then you'll have to accept rarely selling anything for a good price, if at all
Well, Bitmit has according to tosaki (whever tosaki is today) 70 registrations per day. My conclusion is that these are not bitcoin early adopters that want to buy something with their coins but that these are almost only people that want to get first bitcoins. Traffic alone does not drive prices.
@kalinka: You tried to sell stuff to other sellers and finally were successful when you came back to those that have the bitcoins.
I think this could really be a driver for people to buy bitcoins first to buy stuff with it as there really is some cheap stuff on bitmit.
(And yes, there are some idiots trying to sell coins worth 50ct. for $10. There are many such offers, too, but I am refferring to the dilemma that auctioning for $0.0001 will not only not get a fair price but often not even find a buyer.)