A WISP, at scale (50 users or more), should have a cost per user of about $10/m. You can oversell bandwidth considerably, more than most people realize. I've specifically seen an 80 customer wisp reporting their peak time is only 230mbps. This largely makes sense as you people streaming video is going to be your biggest usage, and that really only average 15mbps at the worse. A $1/mbit for ISP bandwidth should be doable in most areas, and since it's wireless your costs per user are actually rather low, given a good tower.
But WISPs do make the most sense in areas where there is no good alternative (only DSL or Dish).
But WISPs do make the most sense in areas where there is no good alternative (only DSL or Dish).