Sure, BCC made BTC holders a lot of money, but think about how that works. If people are selling their BCC and making lots of money, that means other people are buying BCC and investing lots of money into it. All that new investment money that went into Bitcoin Cash? It didn't go into Bitcoin. In this way, forks that have real community support and can therefore cause a split can damage Bitcoin's network effect, and cause new investors to put their money into different coins.

Since Bitcoin GPU is a copy-paste of Bitcoin Cash, it probably won't see much support. But we'll see.