I'm pretty sure that exclusivity usually means quality. If Cryptsy added every new coin to pop out of coingen, I'm pretty sure that people who made coins would opt for an option where there's less competition.
That not entirly true. They add coins even if its only a few days old. What cryptsy is after is money. I almost wonder if you have to bribe in order to get listed there. I am not saying list ever coin, but there are some coins you wonder why they are not listed, or why they get listed in a day or 2 , ect ect.