Omg not again. How many more times do you people need it spelled out? Allow me to try; I'll do it bullet-point style to keep the needed comprehension to a minimum.

1. People are not complaining about PhysX not working on ATi hardware
2. People ARE complaining about features not working on nvidias own hardware, which they paid good money for, just because a ATi card is detected.

By your logic, your saying if you bought a car and the accelerator / brakes didn't work together properly you wouldn't care. Their designed and work within the same "operational environment", just like graphics cards. Win 7 makes it possible for 2 graphics drivers to work together on the same system harmlessly, and synchroneously. Just like you would expect the relationship to work in a car engine and all of its components. nvidia have disabled their own hardware in a system simply if a ATi product is detected. Something which you can comparatively compare to a child throwing a tantrum because he/she has to share their toys. Only in the case of nvidia, they are disabling a feature which in no part communicates with the ATi card just because they don't want a consumer to run a card from the competition alongside their card. Again I must stress the nvidia card in NO way, shape, or form communicates with the ATi card. These practices from nvidia are nothing short of anti-competitive and intended only to be used to try and monopolise. If AMd/ATi chose to persue legal action, they would have another intel scenario on their hands, namely, getting a load of cash in compensation.