awesome idea. +1337 for GPU only!
maybe with a partnership of an exchange.
I think the idea is to mine the coins before they even make it to the exchanges... so you can have plenty to dump whenever (if ever) they get listed.
aehm, i have to write more next time.
my idea was a (own) exchange with promise they add the mined coins after 14 day (example).
every user get a wallet of each coin in his profile and the transaction to this exchange is free. or the exchange is on this site too.
sry about my english.