I believe the first 2 cpa banner ad networks listed here pay via paypal. I have used them for a good few years now on my entertainment site. I get around $0.40 - $0.80 CPM for each banner where I use 3 on each page. That's 3 of each ad format as you can only use 1 of each ad format per page. I also tier them so that if one shows defaults then it will show the other networks ads rather than the defaults that then earns me more. With having 3 banners per page that gives me an average page earning of $1.20 - $2.40 CPM, which is not bad for an entertainment/arcade site. They are both reputable and have always paid me on time, every time. They do have some requirements in place, but so does any other site that are reputable and pays on time and have good earnings. Many other larger sites use these aswell as they are top tier networks. I've given you a link to some reviews that gives quick information about the 2 networks.