pacattack, I think I can answer that question. Here is a simple model (and I sure don't know all the details). Lets say the network buildout costs $3 million/city and to run/upkeep it costs $400,000/year -> so thats 5 million over 5 years in costs or 1 million/year. lets say each costumer pays $30/month or $360/year -> 1 million/360=2778 customers needed for the network to pay off in 5 years. For a city with 50,000 household 3000 doesn't seem very unreasonable. With 4000 customers the network is paid in less than 3 years etc. I don't find a goal to reach 7-10% of the households an unreasonable expectation. Now, the more cities you have the lower the costs (many things can be run together for all cities).
Dilution knows no bottom, greed knows no top.
-Crashman