I think PTS has grown enough that major exchanges like Cryptsy and btc-e should include them. There's already a lot of pricing differences in the trades that occur. For instance, in the forum right now, people are buying at 0.02 whereas the last trades in this exchange - bter.com is around 0.01651. That's a 20% discount right there, which is fairly high in my opinion.
At least the Chinese exchanges seem smarter about this endeavor!