[prawn]

Marketing, making the sales happen, etc. They wouldn't exist if they didn't do something useful.

It's like asking why affiliate marketing exists. It does and it's huge.

[whatshisface]

I suppose I was thinking about the wrong kind of product, I now realize it would be much more viable for one-time small purchases than it would be for repeated purchases or large purchases. (where the incentive to cut out the middleman would be powerful)