" If a large numbers of eyeballs is indeed the lure that causes criminals to write malware " Not very good to base your security practices on an IF! Just because the majority of hackers think this way, doesn't mean they all do. All it takes is one to say "I don't like Macs, I'm gonna hack it." And "boom goes the dynamite!"
It's the 'most people think this, So all people think this' mentality that ticks me off