"so why would they intentionally alienate their best customers, to try and entice the fish with a few extra suckouts here and there? It makes no sense at all from a business perspective."
It makes a hell of a lot of sense. I'm not saying that the sites are rigged, all I'm saying is, yes, it would make sense to entice the fish. Why? To keep them coming back for more. Think about it, if they never hit their longshots, they'd become disenchanted and stop playing altogether. However, if you notice, when players like that suck out, the suckout tends to award them a nice-sized pot. That's what they remember. It's like those lemmings that keep popping quarter after quarter into the slot machines. At the end of the trip to Vegas, they're in the red. In fact, they probably lost more money than they brought because they went to the ATM five times to reload. Why do they keep doing it? Why do they keep returning to Vegas to go through that again. Because every now and then they win $1,200 bucks and believe the illusion that they can become wealthy beyond their wildest dreams. Clank, clank, clank....more quarters into the slot. Fish are the same way. They remember that big pot they won (actually, sucked-out) and believe they know what they're doing and that they can do it again. They don't realize that, in reality, they've lost more money playing poker than they've won.
I'm not saying that online poker is rigged, I agree with you that it doesn't make sense to jeopardized a good thing by juicing the card flow (although greed makes people do stupid things) but to say there would be "no" incentive to do it is wrong IMHO. I belive they don't do it because they believe there will always be fish to replace those that lose heart in donating to intelligent 2+2ers.