I never would've imagined an ISP being run almost entirely by one person. This is super dope - best of luck in the continual expansion of your business! :)
I am currently starting a small ISP to bring internet to our lake community. Fiber from Level3 and Ubiquiti wireless gear (and other hardware, routing, packet shaping, firewalling, AV, e-mail, voucher system, etc). About 110 houses around the lake spanning about 1.5 miles long and .40 miles wide.
It depends on your country I guess, it's very common here where most ISPs by capacity on other networks. But also in the rural / wireless broadband space where you actually have to manage infrastructure there are a few examples.