I get it.

I fly a low budget carrier in the states because paying more for a ticket on a plane with more levels/frills is not worth it to me and I can tolerate pretty much any domestic length flight.

Taking my first international flight next month. I did a small upgrade to Premium Economy. Little more room, could pick a seat early so I could get a window, plug ins, etc. On a 9hour flight totally worth a couple hundred bucks. (Upgraded my Eurostar ticket as well. It was less than $20 to get the upgrade so it was worth it at that price)

First class would have cost me over a thousand more. Totally not worth it for free alcohol and a flat bed, at least to me.