Why do people find so implausible that online Poker is rigged?

I've been playing online poker for about 6 years and have no trouble agreeing there is potentially cheating going on. However, I used to think that the outcome of certain hands was not possible and hands were being made too often. But, after playing at casinos and with friends, I realize that it happens in real games just as often. I'm thinking of starting my own site though! ;)