OMG, are you really trying to equate an artificial situation like pwn2own with the real world? Wow. I think it is more useful to compare the real world where we see thousands of various viruses, trojans, and rootkits that are daily infecting users of MS-Windows daily. It's such a common occurance in the real world, that it's not even worth comment in the news anymore. With OSX, people were running around screaming like their hair was on fire because of a trojan that required active user intervention, to even be of any danger at all, and even then was pretty mild in comparison to the legions of malware out there daily making everyone miserable with the spam generated by Microsoft-based botnets.
I don't even use Mac hardware myself, but I appreciate those who do, because I know that at least they won't be sending me spam.
Of course you’d rather compare real world where the footprint of OSX is minimal. But in a contest where each OS has equal footing and equal opportunity to be targeted—no let’s not look at that.
OSX has avoided issues by being about as secure as Windows 7 and maintaining a small footprint on the world. However, as it grows so too will the hacks, malware, and viruses. As proven wiht the mac guard and defender malware.