It's gotta be. My brother and I rent commercial space as a workshop on a main stretch of road in a pretty big midwest city. I asked a few nearby businesses who they use for wifi, they all said AT&T.
So I go onto AT&T's website and the cheapest option they had was 2mb service for 44$ a month AND a year commitment. I checked 4 or 5 more ISPs and they all had the same or worse deals. I ended up buying a hotspot from T-Mobile.
Now that I'm reading about this though.. If I can create a wireless ISP that can do better than 20$ a MB for just a mile or two of the business boulevard I'm on and it costs about ~10k I'm going to do it. Time to research I guess.