I love this idea! I tried to post a similar idea that may be of help to anyone wishing to investigate into it further. I wanted to create a platform more like ebay, but craigslist seem to make much more sense due to the low cost. Buying and Selling on Steemit

I care less about who gets more money for implementing the idea, and more about the future value it will bring to steemit as a whole, by being a gateway into the platform for those with no interest in blogging.

Maybe they will enjoy curating content or just reading, but a marketplace is a necessary feature that should be implemented. Great work!