This video explains it all. The ESA, the lobbying arm behind the gaming industry, supports SOPA/PIPA. It does this even though a majority of game developers stand against both bills. An interesting subfact is that the ESA makes a lot of money from E3.
So while I was planning on attending, this year I will not be. Or, ever again really, until the ESA pulls it's support from SOPA.
Will you do the same? Will you petition your favorite game company to join...