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I guess if bots were to start spamming it, even in the right communities, the upvoter can decide to go reward the original post instead if he knows the account is a bot/spammer so they don't get the 5% or might even get a downvote. :)

You can just mute that account from posting in your community.

Thats a great idea @midlet. I think it important that all community Admin's are aware of this to prevent Bot abuse. Perhaps you could write a brief post about doing this to send to all community admin's?

Yeah I'll definitely consider a downvote to blacklisted people doing this with my content. Or people doing it excessively with their own content.
It also seems to fool the autovote programs, lol