There’s no way anyone will pay unlimited amounts purely for comfort.
For some people, the limit may be $1K. For others, $5K or even $100K.
That proves my point: at some stage, regardless of the added comfort, your bank account becomes the deciding factor. Even below that level, the decision is still driven first by what you can afford and only second by the perceived enjoyment or comfort.
So when someone asks why I pay more for something, my answer is simple: because I have the money.
I don’t care how much you spend; it’s your money. If anything, the more people pay for expensive seats, the more likely it is that my seat price stays the same or only increases slightly.
BTW, I have several airline CEOs on speed dial. I’m texting them right now to double first-class prices based on my "highly" scientific research.