Sounds more like a problem with the tuts plus at attracting people…
I don’t honestly see a way this could work as such – producing a tutorial is outside of most designers core know-how. But the idea about combining the tutorial and the final product aspects is interesting indeed!
Can’t say I would feel comfortable telling others how I produced the design. This would in effect stop people from buying an already (cheap) item and dissecting it. Which I have done when I wanted to know “how”. If everyone knows how, then the need to buy an item or design would fade. In turn devaluing the entire design community in respects to envato. Just my opinion.