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If your power gets too low than you can't interact on the blockchain at all. So, it's actually there to stop minnows from voting themselves into an inability to post or transact.

but it is possible making a dropdown for minnows that they can upvote with 50% of their power
50% is better than 100%

esteem let's you do it. I'm not it's wise as a minnow though. Again you'll hit a point where you can't talk to the blockchain.