Re: Losing Weight...
I think it's important to accept the changes you make as somewhat permanent. For instance with programs like p90x, what happens after 90 days is just as important. If your goal is a lifetime of healthy food and activity, you're in a much better place to combat situations where you didn't eat the healthiest, you drank 30 beers last weekend, or missed a few days of working out. It's not so much falling off the wagon as living your life.
The membership/exclusivity of working out with people that want your money can make you feel like an outsider before and after the year membership, 90 day program or whatever. That said, these paid professionals have really good advice, and really good ideas, so paying them for that resource is something they've earned, IMO.