Pete... it has to come from within. All it would take is a single disgruntled employee to blow the whistle.

To whom is he blowing the whistle? Thats just the point disgruntled employee goes and does what? Posts a message on a poker forum that says XYZ site is rigged. If a disgrunteled employee in Nevada has evidence that a casino altered slot machines to never pay a jackpot he could go to Gaming Control Board with his allegations and they could actually investigate them. Who does disgrunteled employee of XYZ Poker.com go to?

The software in place must allow for hand rigging or systematic cheating. If this type of software was installed at any poker site, there would be no way to hide it

Who are they hiding it from? Its not like the site allows you to just pop in and examine their software.

If anyone actually "knew" the site would lose all of its business instantly.

Suppose I knew. Lets just pretend for a second that I knew XYZ poker site was rigged. Then what? How would that translate to the instant loss of all XYZ's business.

BTW getting caught cheating doesn't necessarily mean the loss of all business. A few years back the venetian got caught rigging a drawing, they paid a large fine, but they still have customers. People were still making deposits to PokerSpot even after widespread complaints of non-payment by the site were being posted on poker forums.