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I expect to use their power on others, not themselves!

I agree. I've read many arguments in defence of self-voting but I still find it cringeworthy. Of course, everyone is entitled to vote as he pleases and no judgement is intended but I prefer to vote for those who share the love. Here's a handy little 'generosity metre' kindly provided by @andybets
https://steemit.com/steemit/@steemreports/steemreports-outgoing-votes-analysis-tool

Nice tool!