In all honestly, I have researched most of the software that the casinos use, and according to the higher ups at all of the credible sportsbooks, this software is more than fair. The hold, according to most people I have spoken to is actually lower than the Las Vegas theoredical. The crux with online sportsbooks, and I have told all of my friends this, is the fact that there is never a juncture when you leave. If you guys sit down and really think about it, you have probably been up at plenty of junctures at online casinos. Problem is, there is nothing pulling you away to leave while ahead. Time is a killer. Think about when you are in Vegas. If you are ahead a few dimes, your friends all say, let's get out of here, buy a nice dinner and celebrate. When you are up a couple of dimes on your computer, you keep playing until all of the money is gone. My advice, whether Rio management likes it or not, is to either not play, or set an amount that you want to win, and when you hit it cash out.
Bottom line, they are not rigged IMO, it is just too hard to walk away. Either be able to walk away when you are up or DO NOT PLAY!!!!