What makes Bgogo a strong candidate for being a top exchange is that they use a system called trans-mining. You bassically mine coins by trading. There are other exchanges that use trans-mining, but Bgogo will also burn tokens, besides giving dividens to their BGG token holders. Also the 21 supernodes will have the option to list coins. So everyone can become a supernode, of course if they have a good ammount of money or if they are part of a group that has a good ammount of money.