I probably should have included a bit of an explanation.

Back in the dark days when I was running Windows, I used Anti-virus software due to the known vulnerabilities of the system, yet I never once got a virus. In the end, my personal usage policies were enough protection; eg. multiple firewalls, use only trusted software, use software I'm confident is secure (eg. chrome vs. IE), use few programs, one trusted user (me), etc. While Android is certain to have its vulnerabilities, I'm confident that this system will remain secure in my sober, calculated use.

I personally don't feel that anti-virus software would help me on Linux based Android, based on the way that I am likely to use the software, and what I [think I] know of the system. This is an ignorant viewpoint, I know, though as far as I'm aware, the majority of android attacks are trojan APKs with permission settings that don't seem to make sense (eg. wallpaper that requires access to your contacts).

But perhaps you could offer a compelling reason why anti-virus software should be strongly considered or even a scenario, and I'll reconsider.