PPV? 2 questions, or opinions, I should say...

Guys, what's up. Now, I ain't what you'd call a newbie anymore, I'm actually doing very well with cpa, more than making a living to be honest, but, I use a couple of methods and that's it. I pretty much have a team doing ALL my work for me. The part of CPA i've struggled with is PPC, and online advertising of any kind. I can make money with PPC, but to be honest, don't really want to spend tons of money when I can do it with one of my other methods and make close to 5 figures a week profit. Now, my question is, is there anybody in here who has tried several PPV networks and determined what is a very good network? Second of all, do you guys target specific domains with PPV or do you just do the basic keyword stuff you do on PPV. That's what i've been doing (keyword stuff) and it hasn't worked too well, but I don't really get PPV yet to be quite honest. I can see it has potential, and I have the money at my disposal to spend, so i'd like to take a crack at it and try to do my best.