Wrong. Best computer is never a "gaming rig". Games are considered low-end crap when you see what scientists do with computers. Even the best gaming rig would melt with really advanced simulations and computations. Macs aren't for gaming (waste of time imho, go read a book or play real games) but usually workstation class.
Yea, that totally explains why "gaming rigs" have more powerful hardware than Macs.