@RobertOKC - In looking at commercial IoT cellular modems they were about $200 also, and without WiFi, so I don't see getting remote coverage for much less than this for new equipment.
If one wanted to do it on the cheap, then previously owned hotspots are available on eBay for around $40 - depending on the carrier. And then there would be used cell phones that can provide a WiFi signal, but phones will typically be charged more per month from the cellular companies because of the voice capability than a pure data device (although voice is now data too).
Not speaking for Rachio, but if they were going to offer a commercial solution that they would support and stand behind they would want a consistent product - not the cheapest used item on eBay.
So if commercial and HOA users really waste a lot of water and if a Rachio can pay for itself in a residential setting versus a dumb controller, then the payback (my MBA professor is yelling that payback is the incorrect measure and it should be net present value) is just lengthened - maybe by a factor of three considering the cellular service.
Ever wonder why the two way commercial sprinkler systems are so expensive? It may be the communications equipment. The hotspot solution with a Rachio is still cheaper than the Hunter ACC-1200 that I just Googled.
Just my $.02 as I don't have a horse in this race.