You can't eliminate self-votes. People will use cooperative strategies with multiple accounts to the same effect if you tried to eliminate them.
In my view they should be seen as a social faux pas, and it should be totally acceptable to downvote people who make shallow comments and upvote themselves.
Of course there are many exceptions, my main issue is with the people making blatantly shallow comments and upvoting them just to extract funds.
Good point and I can this happening by reading the comments on such posts. Cooperative voting in the absence of selfvoting would exist but I think it would act as a barrier, to an extent, by either removing or reducing the impact of selfvoting.
In doing so you eliminate the legitimate uses of self voting. Such as defending from abusive flags, or to bring attention to an issue with a post (I frequently use it to highly identity theft).
Cheers for clarifying that. I wasn't sure what the benefits were but I see where you're coming from.