Can you really make 'a ton of money' with CPA Marketing?

Hi there everyone!
Just a quick simple question which I wanted to ask you all generally here on the Warrior Forum:

Is it REALLY possible to make some decent money with CPA marketing (i.e. by promoting CPA Offers on the search engines using Pay Per Click advertising)? The reason I felt prompted to come here and ask this question is because I've been working through a couple of 'courses' (which I had to pay for - in good faith) that are very strongly claiming that there is a 'ton of money' to be made using CPA networks!

What I really wanted to know (by posting this question here) before I decide to become directly involved with this 'business model' at first hand is this: Is this really true, or is it just another crock of hyped up 'IM' BS, designed only to make the course creators money, and not those people that took a chance and decided to buy these courses? I may as well elaborate a little further here by just mentioning that one of the courses is called Confidential Conversions (presented by Philip Mansour), and the other one (much more recent - released several months ago) is called CPA Renegade, launched by Saj P (and presented by Mo Moller and Ashley B).
The thing is, the courses really DO seem very highly believable and plausible, and all of these guys really DO seem to be absolutely rolling in money too!

I am hoping that someone here who is familiar with CPA Marketing as a possible means of being able to make 'serious cash' online (and who has already well and truly put it to the test by doing it themselves) will be able to answer this question for me. Any input or feedback about this would be very much appreciated.