Personally I wouldn't do anything with them. It's just been general not-so-great experiences with groups of TNT runners in the park and other than the NYC Half Marathon where they cheered for everyone, their cheering squad needs to learn some race-cheering manners like cheering for everyone (don't get me started on the stretch of road at the WDW Half where there were people who were absolutely silent until they saw that darn purple TnT shirt, ignoring those of us working just as hard going by). But people are right that the cost depends on several factors: your distance from the race, how much travel is involved, how popular the race is, etc.)
I know it's popular to put down TNT as a whole because their supporters "don't cheer for you", but mainly that is because a lot of TNT runners are running their first race. That means a lot of their supporters/cheering section are cheering at their first race. They may not know that all runners need the support no matter which shirt you are wearing during the race.
That is not the fault of TNT, but I can see where your frustration may lie....
I don't like that you're not allowed to make your own travel arrangements and have to add the amount (I suspect and then some even beyond the charity contribution) for their arranged travel onto your fundraising. I'd rather get to the race and arrange my lodging on my own (also avoiding the annoying 'we must stay together'-ness of it where they're in a block of rooms) and have most to all of the money I raise going to the charity. I'm not a control freak, but I want a darn say in how I travel there and where I stay.
I have done a couple TNT events and that was not my experience at all. I "deviated" from the "team flight" everytime, and booked my own accomodations at 1 of the 3 events I did with them.
I actually liked the "stay togetherness" of the team being at the same hotel, because the TNT'ers from my chapter became friends of mine during our training together, and we wanted to "be together". You also get to meet a bunch of "like minded" individuals from all over the country. I have met some "race buddies" from TNT events that have ended up doing other events that I have run as well.
i do understand that the "social aspect" may not be for everyone, but I think it plays a large part for "first timers" to have some support from people who are going through the experience of a "first race".
I don't like the being tied down to their plan and their group for training. I am one of those who actually likes the solitude running can provide and the thought of having to run with a little group and a "mentor" chirping at you all the time would make me want to quit. Apparently they're introducing a "flex" program this year where you get the program online...but basically I'm far too independent to be as groupy-groupy as they are. (I've also known a few people who ended up with major too-much-too-soon issues because they were taken way too fast from barely doing anything to training for fulls. So it's not always the most sound coaching for someone who's never run a step in their lives - though it seems to depend on your little groups cheerleader, um, I mean mentor.
I wouldn't say that you are ever "tied down" to a training plan. I followed their plan for my first race, mainly because I was not a runner, and their plan was better than the one I had before joining TNT (which was none!).
The other times that I have run TNT events, I followed my own plan(s) and ran what I thought I needed to/wanted to. I have never had a TNT Coach or Mentor "chirping" at me or any other participant in my chapter. They are very supportive, especially to first time runners, and the goal is to get you to complete your event, not browbeat you into submission.
BTW... mentors and coaches for TNT are 2 different things. Coaches are involved with the training aspect of the event. The Mentors are "TNT Alumni" who help participants with their fundraising and provide support. It's a lot different getting advice about TNT from someone who has "been there" and done the fundraising and training. That what the mentors do....
I'm not anti-charity at all, in fact I'm already planning to run Boston in 2013 for a charity because I know I'll never qualify on time. But it'll be one I pick, and given that I live in NYC I'll be doing it on my own with the help I might ask from from my running club friends and coaches.
Just my thoughts on it.