said by kapil 
:Yes, thanks to a concept us IT and Security folk call security-through-obscurity.
There isn't as much malware targeted at Apple products because the criminals profit more by targeting Windows machines since there are many more of them.
I believe that is certainly part of it. Part if it is the amount of user intervention required for propagation as was the case with the LEAP-A worm where it required user installation like any other program including providing admin privs. The biggest is that these lab discovered exploits are often quickly patched making propagation impossible.
