When I explain how I operate, people tend to understand pretty quickly that it's special. If someone was, say, a Google engineer and trying to pay $0, I'd just not renew or whatever.
In general, poor folks aren't going to cheat. If money's tight, they should pay less, that's not cheating it's just sliding the scale to meet them where they are.
Whether you are cleaning toilets, flipping burgers, staffing a call center, or any other thankless job out there, you still deserve your dignity. We as a society have decided we think the job you do is important enough to pay someone to do it. You should be able to live your life on that pay. Or even if you are unpaid because you are a refugee, stay at home mom, student, or anything else, you are still a member of my community. You are still my neighbor. And therefore it's worth making sure you are surviving with dignity.
We've had people rent for nothing, rent in exchange for teaching a skill or hobby, pay at cost, or pay more (the money is held to offset people who cannot afford to pay the full cost of room).
In general, our rental timelines are short, 3 to 12 months usually. People often need a stepping stone to get themselves a leg up and move on to something else. We're happy to make that possible.