AFnord: I think a better approach would be to reward those who openly oppose these bills, by buying from them, rather than a blanket punishment.
That would be rather difficult. Many "oppose" this types of laws in declarations, but actually support organizations who fight for this laws to be passed.
Look at the music industry. Producers can say whatever they want, as long as they fund RIAA then it's just PR bullshit. Same with movie producers and MPAA. Same with game publishers and ESA.
Basically all this organizations get payed to further the interests of their supporters without drawing public reproach on those supporters.
How many game publishers have announced they plan to remove support from ESA and boycott E3? It's all about putting your money where your mouth is. And in this case their money sits very well behind SOPA/PIPA/ACTA while their mouth is saying they are against it.
If you find a publisher/developer that is verifiably against these shitty laws, then by all means, give them your money.