yertari - I know many people here May Be interested in a original level design and building service. I can imagine a service were a broker like you creates original content.
I would see a higher price if the members wanted full rights to the content and a reduced price if you the broker could sell 50% of the level assets on your site.

With the second option users can get an original level at a reduced price and even still maintain a unique level. And you gain more assets to sell in single or set.

Is this a concept you might be willing to follow?

Thank you
Mal