I've read a case study of someone with essentially this service trying to make money by offering a pro service. It's not going well. So it might be hard to get

I've read a case study of someone with essentially this service trying to make money by offering a pro service. It's not going well. So it might be hard to get enough people to pay for it to make it a sustainable business, but at the same time I would have a hard time recommending anyone do anything important through a free service where I couldn't see what the provider was getting out of it.