The reason is not saturation...at least in most cases. If a method/system can be saturated then it is not a good method in the first place.
You dont need to know how to make money to generate sales. Sounds controversial right? Think about it like this, you dont need to know how to cook corn to sell it in the street. You can buy it or hire someone or wtv. Same way as those wannabies IMers. The product doesnt matter in most cases, what matters is copywriting, some logical skills and some traffic.
I don't judge these people tho. They kill a LOT of potential competition and at the same time they bank. There is a reason why these WSOs are sold by pennies. You get what you pay for. Simple as that. But to be honest, there are MANY good WSOs with very good valuable info on it. But its like 1% of it. But guess what? What is valuable info for me could not be for you, and vice-versa. So again, you get what you pay for. The only sad part of this, is the way they are being sold. Tricking peoples mind at it best...like on the real world tho ahah!
And I will tell you this. When I first started (many years ago) I bought an ebook and a shyty script that was poping up in all my ads in all the sites I was visiting. After I bought it, read it and check what that shyty script was all about I immediately tho to my self: THIS IS PURE CRAP!!!! But guess what? The copyrighting was sooooo fking good that it was impossible to think that before buying the product. I realy tho (before buying it) that it MUST be something VALUABLE of my buck. But I was wrong of course.
Do you want to know what happened next? I could had ask for my refund but I did NOT. I could had spend more money in more products but I did NOT. In that time, I start doing my own research instead of going into the easy way (like these products are advertised). I start learning and implementing what I had learned. And eventualy I start learning from mistakes. The best way to grow (at any aspect) is by failing. I see this in many people....they literaly FEAR the posibility of failure and thats what push you back.
Sorry for my long reply. I just want to end it by saying this. I WAS THERE......but glad for you, you already realised it. So make your self a favor and dont buy these crap products. So start learning and working, sooner or later you will succeed. This forum contains all the info you need..and the best part is FREE
edit: if your realy want to check out some of these WSOs you can go here wsodownloads.info