The "customers" are ski area managers, they pay me to publish their maps and generate their trail reports.
The sign-up process is slightly obtuse on purpose. Because I'm still busy developing the site, only the really motivated customers actually contact me (via the "Contact" page), so I don't have to spend too much time doing a sales pitch that goes nowhere. I'm fortunate that I have a decent runway to play with.
I'll change that a bit this summer once I'm no longer frantically building out features.
There is effort required on my part for each sign-up, mostly around cleaning up GIS data that new customers supply, although I do supply a backend with tools for map management. The ski area managers are often extremely non-technical, and like the personal touch. I charge a modest premium for that.