If that were the case, then you wouldn't mind deplaning after a couple or four hours of sitting on that seat and discovering you never left the first airport. After all, you were paying for space, right? And you got that space for several hours, so what's your complaint?
Of course that's silly. But my point is, you're not paying for space; you're paying to arrive at a destination. As long as you get to your destination, what's the problem?
Comfort? Take a long look at those seats. Are they really designed for comfort? Now take a long look at the back of your ticket. Is there any clause that guarantees you comfort?
The answer is no. Any comfort you experience is a bonus. Don't believe me? Go visit a lawyer and ask what your chance of success is if you sue the airline for being uncomfortable.