What do you guys think of this spreadsheet of different pools' average block rewards:

https://docs.google.com/spreadsheet/ccc?key=0AjO2-Jpd8jUgdEdWeURuRWYta0ktRGgza3NSai01SUE#gid=0

Either the RNG is severely biased (with an average block reward of ~478k instead of 500k), or scamming is rampant.