Why invest in WISPs rather than traditional cable companies?

Building wireless internet infrastructure overall has a lot less footprint than running cables to each house. Wireless network only need to have access to fiber at one spot and access to a few tall buildings to set up the network. No digging on the ground and less maintenance for broken wire. The set up time is a lot less (few weeks to a few months) compared with 6 months or longer for most cable companies to establish network in a new neighborhood. The capital barrier is lot less (typically $100k to $500k depends on expansion or set up a new site for a city) compared with $5-10k per mile for fiber.