Not really. It's more of:

    - many would prefer to whitelist trusted software than blacklist malware
    - bypassing AV is trivial 
        - http://www.sevagas.com/IMG/pdf/BypassAVDynamics.pdf
        - https://github.com/Veil-Framework/Veil-Evasion

That many security experts use GNU/Linux or *BSD is definitely a factor, but many people still use Windows.

Great question, though. :)