10secondsurvey: Please Show me just one shred of real (not pseudo- theoretical nonsense worked out on the back of a fag packet) evidence that your seat on BA is 10% cheaper because the seats are two inches closer together. It is not such a simple calculation that you imply.
It surely is not. But it is equally surely the case that if you increase seat pitch by 10%, do not raise fares, and sell the same mix, your trip revenue will fall by 10%.
For a real life example, I have but six words: American Airlines, More Room Throughout Coach.
I am also afraid that Sherlock Holmes has caught me out. I have to confess to not only being a regular piece of back-of-the-bus SLF, but also a regular BA-flying piece of back-of-the-bus SLF. And, in addition, to the very formal connection of owning a couple of hundred shares in BA so that I can get the shareholders 10% discount when I buy tickets directly from BA.
At any rate, I have the choice. You're welcome to fly FCA if you wish. But I am happy with where BA is. If they moved to 29" or 27" or 26", I would cease to be and I would take my money elsewhere. But you would impose 34" on me and the necessary extra costs. I would prefer to keep a choice about what I do.