Continuing with that logic; the prevalence of beggars on street corners indicates that their patrons appreciate their presence in the space.
If I wanted premium service and a premium seat, I can pay the premium price for business or first class, or fly on a better airline. Even though people complain about the terribly small seats and lack of service on budget airlines and economy tickets, they still choose the lowest seat price above anything else. And the cost of plane tickets has fallen drastically over the past few decades so it's not like the same product is more expensive, people just want cheap flights.