Hey Amin.
Have you checked the site I mentioned?
If not, I strongly suggest you go there, maybe it can help you get more business…
Besides this, if you can replicate the possibility to register as a vendor, the upload funcitonality, with a similar (but less complex) description, tags, …
If you can add the possibility to merge the affiliate function as an additional tab – incorporate in the small “personal dashboard” displaying sales.
Seriously, if you are capable of doing this, let me know!