I'd like to develop an ecommerce site where I could allow others to sell items, things like pictures, videos, flash, etc. I want to be able to keep a percentage, and pay the rest back to the seller.
Is there anything available, DotNetNuke, etc. that would do this or help get this started. If not what's a good way to approach this with the goal to avoid upfront time and cost.
I'd like to think there would be some revenue that could be reinvested over time, so might grow into something that has some cost after a while.