aMember pro, all the way. I've been using it for several months and it works quite well, although I don't use it with a CMS, but it is certainly WP comaptible. Now it's even better, too, because they support all major adult payment gateways, which is a very big deal. You can check my site in my sig to see it in action.
As for premium sites, it would depend on the content, competition/niche, and how well you can drive traffic to it. I would certainly advise against getting your hopes up and assuming you can buy the Playboy mansion by the end of the year, but if you stick with it and deliver quality content, you should be able to make a living eventually.
Hit me up on ICQ if you have any questions!
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