Check unreal fan forums and you'll find most of them could care less about physx, or flat out hate the entire idea.
No, I would say that ppl don't hate the idea, they're just too goddamned cheap to spend some money for a better game experience. PC buyers/gamers have gotten used to getting something for nothing for so long (like freeware, downloading free music & vids, cheap blowout prices on last gen hardware, etc.) that they expect it now.