Jenn-
A big part of the problem is that the guy doesn't do quality control. When relying on user submissions and random stuff that you run across on the Internet, I'd think quality control is pretty key, but... meh. I found that, if you switch the area codes, some of the payphones listed on there are still active. Just a few, but there are. I think my city is down to about 2 dozen telco-owned phones, with a majority being in a Greyhound station, and the rest strewn about the city (mostly in bars)