They did things differently compared to other airlines, so it does warrant an explanation. People pay for the cheapest flight, and expect things like free bag checkin. Other airlines will charge everyone more, even if you had no bags and provide free bag checkin. I've had flights where I only had a small backpack and nothing more, I don't want to the "priced in" fee assuming everyone will check a bag. Spirit gave you exactly what you paid for, which is how it should be. No marketing mind games to trick you into thinking you're getting some luxury service. Even in first class most domestic airlines provide a subpar experience, might as well be for a good value like Spirit did. International flights are different though, and the bar is much higher there due to length of flights.