This is a human factors issue. The human brain can only balance so many factors. You could design an algorithm, where people placed value on certain features, I need x” of legroom, and I am willing to pay up to $y per extra inch. And $z extra for internet use. And on and on. There is a rational way to do it. But it takes too much effort.

Not to mention it would be very expensive to roll it out on an entire fleet at the same time. And what if the service is down, would passengers get credit if it doesn’t work, when the bought a flight that was advertised to have it?

In a perfect world full of perfectly rational beings, your situation would work. Unfortunately, most of us lack the time, patience, and attention span required to regulate our own lives to the degree to benefit from this.

The IT world is full of stuff that is *possible*. More often than not, the problem is not the technology so much as the people, who would need to learn a new way to achieve any benefits from technology.