The greedier ASICMINER gets, the less profit they make on each coin, that's because their energy costs rise as fast as they add gear. At some point they wont be able to pay a dividend as all their revenue will be going into running the bloated ASIC farm, for roughly the same number of coins each week. Then there is a good chance they will have to close up shop, leaving a  lot of worthless shares, but also that means 1,000TH/s+ suddenly disappears from the BTC net hash rate, and confirmation times blow out until ridiculous, effecting everyone.