Hi! I am a marketplace entrepreneur myself (Sharing Academy) and have helped dozens of sharing economy entrepreneurs as well (Lendi, Truke, Mentor Alliances...). What worked best for me was convincing the users to become team members.

Our best programming tutor in Sharing Academy became CTO, his best student in the platform became his intern. Another student became head of our customer care department, and so on...

Build a great product, engage wit your users and make them become part of your movement.