It's funny, because the answer would almost appear to be no. PT is expensive compaired to most of the others. It makes no real sense unless you really have to have it to get customers. But that's a sad reason to choose a DAW.
I have a few friends who went with Pro tools for the same reason people buy Gibson and Fender guitars without looking at alternitives. They both have way more money than I do. The one guy has well over $10,000 in his rig. It's nice but so far I havn't heard anything good come out the other end. He might as well have a Fostex 4 track.
There's also someone around here who used to use Pro Tools for years now but just swicthed to Cubase. He said Pro Tools is just too expensive to maintain and he's not doin enough recording to justify that. He really likes Cubase and said it does more than he thought it would.
Pro tool users all think the other DAWs are inferior I guess.
A few of the Mac people around here like Logic the best.
Anyway's Pro Tools is probably what you call a good investment if your a busy studio. And I'm sure it works as good as any other DAW. It's not a DAW for Hobbiest unless your are a retired Dentist.