I'm not sure I agree. I think my behavior, even if treated favorably by the community, will likely not weaken the norm against multi-voting. Karma seem a much less useful signal here than in communities where the prohibitions against "near" behavior are less strict. That's just from observation, although I think an argument could be made that if a signal really is easy to counterfeit, it's probably less counterfeited when that fact is generally known (no easy opinion arbitrage). But certainly not worth arguing.