Here is how a very intelligent fellow on another forum explained it to me:
1. I have played thousands of
hands. I am dealt cards at mathmatically correct
odds. I do go through stretches where I am way off, sometimes for me sometimes against me but in the long run I am dealt the right number of hands. There are people with databases containing millions of hands. They find minor discrepancies in the way people play and use it against them. if there was as large number as 2% they would spot it instantly. Have a look at the zoo at 2+2. these guys track down bots for fun using there databases.
2. The major poker sites make huge amounts of money. As the big 2 are privately owned we don't know how much money they actually makes but it is a lot. An allegation that is backed up with even partial evidence will bankrupt them overnight. Being rich does not mean you are moral but it does mean that you are probably smart enough not to risk it all for what is in effect a small amount of money.
3. There are a huge number of people involved with the running of a poker site. The guys at the top do not write or support the software. They have junior low paid staff to do that. As these guys are not that well paid they tend to move on. However, if there is something written into the software they could easily stumble over it. This is not just something that can be easily covered up. That was how UB were originally busted and in the most recent discussions it looks as if they were being blackmailed by a low level support bod. That scandel broke when there were far fewer players or databases available.
4. If online poker is rigged why do the same people who do so well online do so well offline with live dealers.
5. The sites dont need to tempt bad players to play. Gamblers anonymous has been in existance for over 50 years. Well before the internet let alone online poker.
My response to him was that there would be much fewer poker-is-rigged threads if forum regulars would respond with this kind of reasoned explanation rather than knee-jerk ridicule. The ridicule only makes the suspicious losing player even more suspicious because it looks like there's some kind of coverup conspiracy involving winning players. So thank you for nothing, Cardschat. I had to go elsewhere to find a poker (and computer) expert with enough common sense not to belittle me.