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Minnowsupport votes at $2.72 every 2.4 hours. If the round isn't full it'll do a partial round and caps you're earnings at 10% gain from the vote also makes sure your vote isn't at a loss of more than 10%.

What reference price for PAL is being used to set the +/- 10% range?

last? bid? ask? 24 hr volume weighted average price?

So basically you can get lucky and earn 10% or be unlucky and lose 10% or you get something inbetween.