I was going to post the same thing about Mac. Apple's fraction of sales is so small that the platform is ignored by the creeps that write viruses, malware, spyware, etc. Just the same, I run a Linksys router with NAT, NetBarrier X3 that doesn't allow my machine to be a server or call out and Norton Antivirus. So far, no problems.
Now if only Apple would solve the bit-rot problem in Safari.
Is that where it starts getting really slow to open and The Magic Multicolored Beachball of Eternity spins away? I use Firefox now. But it too has quite a few problems.
Part of me wants the Mac market share to grow so there'll be more Mac games written while the other part dreads the consequences of this.