The PCGA has been a joke ever since it started. Not only were some of the members blatantly not interesting in helping develop a larger market share for PC Gaming, but they've done didly-squat to actually help the existing market.
Who did you have?
Capcom- Resident Evil 4: oh, PC's have mouse support,hmm, I guess it's a fad, we'll let it wait a while and see
SonyDAC- That's SecuRom people, SECUROM.
Epic- They have a much larger market share on consoles, and haven't produced a good PC game since 2004
Harware manufacturers- higher specs=more money no matter what, they get publicity from the PCGA, but nVidia already has the largest market share in video cards, so why bother.
Microsoft- they made Games for Windows Live,Vista and were hoping to get a foothold in digital distribution, but they failed for the most part
Gamestop- Since most DRM prevents reselling PC games, I'm surprised they haven't quit yet
With a membership fee of 5k-30K a year, it's more of a ponzi scheme.
Heck, Stardock did more with the Gamer's bill of rights, even thought they themselves made a mess of it with the release version of Elemental.
In fact, why do you think you don't see PC devs and publishers in there? No Valve, no Paradox, no Stardock, no 1C, no actual publishers that actually have a say in what crappy DRM gets rammed down our throat, what limitations, what prices, what time we have to wait until we actually get to play games that have been released on consoles ages ago.
Again, The PC Gaming Alliance is a joke.