Some of us (e.g. anyone who works for the federal government and many federal contractors) are required to use the cheapest available tickets. It's not like we have a choice. The airlines, in pursuing lower base ticket prices at the expense of even minimal service, have completely screwed us, because we have to buy them.
I'm very tall (2 m) and regular economy seats are, quite literally, torture. I succeeded in convincing my organization to let me upgrade to Economy Plus (or the equivalent) by claiming that, for me, it's an ergonomics issue. But it took months of fighting.