I bet the people that can only afford to fly Spirit are happy once they get to that exotic, faraway place that they couldn't otherwise afford to travel to. We'd all love to fly first class everywhere if we could.

(The drip pricing is a problem and probably needs some tegation or something, and more gates, noreairports, and more route competition. But that is a aseparate issue than deep budget airlines, which you see even in highly competitive markets.)