I'd like to add my $.02 (I thought keyboards had a cent key

). As a poker dealer I see the same cards and plays as online. Players cry rigged when they are taking a bad beat or make poor choices online. It's much harder to make that claim at a live game! They just go off in a huff.
Collusion does exist at both B & M aand online. Most collusion backfires. Certain variants missing such as, knowing what the other players are holding, make cheating by collusion ineffective. They may increase their odds somewhat, but ultimately can hurt them more than help them.
I found a website awhile back (don't remember the name) that addressed the statistics of dealt cards online vs B & M. It was very interesting and put my mind at ease. It was a guy (independent of all sites & location) that did a controlled study of the hole cards, flops, and board in general. It was almost statistically identical for B & M as online.
Personally I stay away from high stakes single table SNG's online because of collusion potential.