One observation I have made is that when you are transparently keeping a percentage of revenue from the person actually providing the service, there is often a

One observation I have made is that when you are transparently keeping a percentage of revenue from the person actually providing the service, there is often a huge disconnect between what is perceived as fair, and what is required to make the service work. By the time you factor in credit card fees, provision for loss, marketing, the economics don't work unless you are keeping 30%, and then the people providing the service feel ripped off. Unless the service is inherently viral with zero marketing costs, it is really hard to strike a good balance.