Just read this article - http://www.cnbc.com/id/100785679?__source=xfinity|hero&par=xfinity - which describes United's new subscription offerings. You pay an annual fee for perks like extra leg room. I don't fly enough to even consider it. And don't know if I'd consider it if I was a frequent flyer. Every time I travel these days I feel like I'm being nickel-and-dimed by the airlines. Do any of you frequent flyers think it's worth it?

United economy plus isn't that great in my opinion and I have flown that both domestically and international. Other 'economy plus' carriers are worth it though, such as EVA or TG to Asia but that of course is not a subscription price
I would pay 500 for elite status on certain carriers though and I do have club/lounge membership.

I feel like the business model of US Airlines slowly moving to one where they make flying as uncomfortable as possible so that they can collect more fee revenue. You know, withhold most of the window and aisle seats and charge passengers for access to them. That's already the case on several airlines...

US Air is my main domestic carrier as i live in phx. I am chairmans flying more than 100k a year.
But USAir has one of the better frequent flyer programs in comparison.
One thing people should consider when they start traveling is will they or try to use a certain carrier and how, if not free or minimal cost, get better boarding and seats. It is possible.
But yes, airlines need to make money, and some of their revenue streams also annoy me. Look at it this way, would you buy airline stock if it is that much of a moneymaking machine?