Windows Phone Thoughts: Do You Pay For WiFi?

I just got another press release from Boingo announcing that their WiFi service is now available at LaGuardia Airport. It seems as though they're always announcing the addition of some airport, restaurant or hotel hotspot, so it really didn't get me too excited.

I've used their service before, mostly while spending a few lonely late-night hours stranded in an airport. I've also used similar services from other providers, but it's always been for a single day or a few hours while on the road. I've never had a lengthy subscription to any kind of WiFi hotspot services.

So, it struck me...Who actually DOES buy WiFi programs like those from Boingo or T-Mobile? And, what are the criteria that make people want to use or not use subscription-based WiFi?