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First off I don't use Slush anymore, I did several months back till I pointed my hash to Kano, but I did see that they dropped their 2% effective 8/1 and also started alt coin mining at the same time. But instead of giving you the alt coin, they instantly sell the alt coin and convert to BTC and add to miner rewards. Have no idea if that really makes a difference, but figured I'd chime in and make everyone aware.

Thanks,