No.
Look, I'm not going to claim that OS X is invulnerable (it really, really isn't) -- but the marketshare argument is BS.
Why? Well someone else has said it best. From this Slashdot comment:
Same applies for OS X (although to a lesser extent, in part due to Apple's prioritization of user experience over security.)
That's not to claim that OS X won't ever be exploited, but I do think that it presents a much, much smaller target than Windows. Dig?
I am not attempting to be a pundit or what not - but, I will have read too many articles from security analysts (which I will not go tracking down - google is for that) and hacking competitions that i am going to have to side with them.
lets just agree to disagree. going to sleep. laters.