I am 1.96 m tall (6'5") and I would also pay 10-20% more for some leg room when I pay for the tickets myself. But when I fly for work purposes (i.e. the vast majority of the time), this is not an option, regulations say I can only fly in economy class. I suppose many people is in the same situation.

I don't really think having enough space to actually fit in the seat should be considered a premium. It should be a right.