The less you buy PC games the less the developer will care about developing games for the PC. If you produced and sold rubber thimbles and people stopped buying rubber thimbles would you still produce them? The execs at these companies aren't reading Hardforum or other gaming sites. They're looking at numbers and making decisions based on those numbers. Low PC sales doesn't translate into them dumping more money into the PC version. It translates in to "ahh, it's not selling. Fuck it, dump it".
On the other hand...so what are we to do keep buying the garbage so they can pump out more of the same crap? That makes no sense as well...