Are low stakes games a suckers play at Full Tilt?

[BradleyT]

They should have enough data to determine if they make more by raking 10% and having nearly everyone lose instead of 5% and having a small percentage of those players break-even/small winners who may eventually move up and pay higher rake.

I would think they'd want every micro player to do well so they could move up and pay more rake per hand but maybe not enough of them end up moving up.