I think that people see the luck growing with Slush and point there hardware here, the problem is that by the time they identify that we are being lucky the luck is probably running out so then block times grow and our rewards drop. This is the downside of luck, it can be good or bad and no one can ever tell how long it will last.

The big problem is that many miners are both greedy and stupid (present company excepted, obviously) and therefore they move their hashing power around thinking they will make a fast buck, instead they probably actually do worse because of it, and don't even realise.

The other explanation is that all minders are neither greedy nor stupid but instead a pool has failed and many miners have failed over to slush, its just a coincidence that this always seems to happen whenever Slush is experiencing a run of good luck.

It is what it is and frankly I welcome the new hashing power, I only wish they would stay and make Slush even bigger. Personally I think Slush deserves to be at least 20PH/s.