Hey, I tried this and I can leave a bit of information on how it went for me.
I tried few methods on how to get traffic, one I figured got me enough traffic to make quite some money. First I created a nice landing page with Getresponse landing page tool and bought a domain. Then I joined some money making groups on facebook and I posted my landing page link there manually so that would give me around 10 $ on AAX per day if I spent around 1 hour posting the links. Cashed out 50 $, it took some time to get the money out as AAX cashout service is rather sketchy and takes long time.
Then I bought some facebook accounts, bought a fb poster bot, hired a dedicated server and set up the bot to join fb groups and spam my link automatically. That would get me 30-40 $ a day without doing much, just that fb accounts were getting banned quickly so I needed to keep buying new ones. Well, problem is that I couldn't cash out my money that I made that way. The commissions didn't get approved. I opened a ticket asking what was the problem and they replied saying that I might have violated some rules and they are going to run an investigation. A month or so later my AAX account got terminated with the money in it. I didn't really violate the agreement as I was using a pretty straightforward landing page (similar to the ones AAX are offering, just prettier). I guess the reason why I got banned was that I wasn't profitable, the facebook traffic didn't bring them leads I assume. So I guess even though it's pay-per-signup program, it's not going to give you easy money if you don't bring them profit.
Just my thoughts, don't know if they are correct or not.
Thank you OP for introducing this method anyway. Learned quite a bit about e-mail marketing bussiness from this whole deal.