/sarc
You are begging the question... You claim that the evidence there are no Mac OSX viruses is NOT because it is inherently difficult to write one... it's because it is obscure. We have pointed out MANY TIMES that crackers have profitably written viruses for far more obscure devices to 50,000,000... such as the Witty Worm virus that successfully infected ALL ~12,000 un-updated BlackIce protected Windows Machines it was designed to infect less than 45 minutes after it was released into the wild regardless of where they were situated in the world; or the ~30,000 cellular phones another virus writer created his opus to infect; or the dozens(!) of iPhones that had been converted to run Linux that an enterprising cracker had written a malicious virus to infect... yet not one cracker has successfully written one to infect the 50,000,000 sitting duck OSX computers out there, of which more than 97% are conservatively running sans AV? And only 18 have come up with anything close to a viable Trojan? Give me a break. What this proves is that the malware writers go WHERE THEY CAN MAKE MONEY... where the vulnerabilities are. It proves they have learned to go after the low lying fruit.
Security by obscurity where Mac computers are concerned DOES NOT APPLY!
THAT is the point.