Exactly. We usually aim for a 10-month ROI and that's using higher-end Cambium radios (way better for ops at scale than something like Ubiquiti), Juniper networ

Exactly. We usually aim for a 10-month ROI and that's using higher-end Cambium radios (way better for ops at scale than something like Ubiquiti), Juniper network gear, batteries on everything, and proper telco circuits. We also have a few thousand subs so we get economies of scale on transport and transit. (digression) There's a kind of WISP valley of death roughly between the hobby WISP (0-500 users) with a owner/operator and one or two employees, maybe running on business DOCSIS for upstream and Ubiquity and/or Mikrotik radios & routers and the professional carrier WISP (2-5k+ users) with biz people, experienced ops people, longhaul fiber or licensed microwave for backhaul, etc. Small WISPs often can't afford the time or money to be proper (if they even have the experience to know what proper is) until they pass the valley of death. Many fall to bankruptcy or burnout trying to get past the valley.