Meh, yes Spirit takes people who otherwise would travel on a bus, but there are plenty of wealthy people who chose to fly on us for a multitude of reasons. Unless you are traveling first, is there really any difference in Spirit vs the other Legacy carries? United has the most miserable FA's, & Gate Agents, Direct TV that you have to pay for on the new planes and it takes 45 minutes to get off the airplane when reaching the gate. As far as I am concerned, unless you are an "Airline miles reward *****" there is no reason to pay more on a legacy airline on the same route.
(Unless of course you are over 5'5 tall

)
As far as I am concerned the only airlines I would pay more $$$$ to travel on is JetBlue & Virgin America.