With all due respect i have yet to encounter a single economy seat that i can sit in without my knees clashing on the underside of a tray table or seat pouch full of literature.. and the problem is only getting worse. I can assure you if I had a choice of unencumbered leg space i would take it!

By your logic I am forced to always pay more money to fly and i would not class myself as being abnormally tall.

Thankfully most airlines/staff adopt a common sense approach to this and i ensure I check in as soon as possible to ensure i have a choice of seat.