Yeah! That'll show those damn publishers! Err... wait... no it won't. All it'll do is reduce sales of the PC version and increase sales of a console version.
If you're going to boycott games that use GFWL, you need to boycott it on ALL platforms. Buying it for another platform doesn't accomplish anything because the publisher is still getting your money.
I also bought this on the PS3 for the same reason (along with FO3 & GTA 4) but it was nothing to do with boycotting or making a statement, I simply wanted to play the game legitimately without having to put up with the GFWL crap.