I don't believe much those sellers that claiming the methods as their own but the truth is not, I think they have just got it from the internet shared by generous geek guys maybe on other forums and blogs. There are really lots of them so always make a background research, we can learn by self study.
I think this is correct, many of the methods are not original and it is something they just saw in another forum and they are trying to earn a quick buck, that does not mean the method may not work but since they have not tried the seller will be of no help if you run in trouble.
The fact are those method are old but they are changing something and resell them so old methods are still working but they are just adding some other way or path how to work with that method.
Much better to do if you want to earn money better to learn a skill that you can use to sale your own service. because all method that you can buy from seller you can be still find in google except for other method that actually you will never seen in any search engine like advertising without paying any cost that works in CPA.. if you know seo it is not related in seo but you can do fraud in advertising just using the coupon..
I just tested this method before but i stop because every month the method changes and too many to do before you can gain a massive earnings..
Try seo instead if you don't want to spend a lot of money there are many whitehat methods to rank your site and monetize your site to earn a good amount of money..