"I suspect that it wasn't as profitable to target the Mac platform at that point," he explained. Mac-codec.com "probably closed because it wasn't commercially viable for them to conduct business."
Well let's not disregard that interesting nugget. We see a lot of anecdotal evidence of this so called Mac malware but finding infected machines seems to quite hard. Much the same as Windows. I owned a Windows machine for about 8 years, I only ever caught one malware infection, that was my fault for running knock-off software from a dodgy source.
If you're careful you can avoid catching things on any platform, you really have to be going some to get a seriously ballsed up machine on any platform!