poker sites "juicing" the game

I'm a serious novice player and have heard some folks disparage party poker and other sites for juicing the games. I know this has been discussed extensively. Basically, what are the opinions of more experienced players? Do these sites intentionally program the deals so that lower sets face higher sets to increase the action and so then increase their rake? Might this happen. Seems like it wouldn't be that hard to do, but if found out would also be the demise of the site.

Thanks for all input and looking forward to the discussion.

zenpractice