I think walking into an official apple store and looking around makes my facts pretty good. As said earlier, there currently is no standard 3 button + wheel mouse. Keybinds make certain commands more difficult. For example, jetting in Blockland. Instead of easily using one finger on my PC mouse, I have to adjust my hand awkwardly to hit the closest available key for jet. Same with a few Half-Life 2 weapon features. Right-clicking is much easier to do then binding a key and having to move your hand around more. Or adjusting your hand to make a fancy hand movement on one of their special mouses, which just doesn't meet the need for good gaming
Also, Apple was bribed/bullied into never using AMD chips, unlike PCs, which openly allows any chip brand.