$100 / year. Since the idea is that you need to host as many times as you camp, that means that you'd be limited to camping only half the year: gotta stay home to host for the other half. So you could only hope to use 180 days, so the honest advertisement would be "at least $0.55 per night, but probably quite a bit more".

I guess if you can host several people at once then maybe you could do better?