Each to their own, but I just checked a United flight to Budapest and back in June.
$1800 basic economy. really, really, really restrictive.
$1900 regular econonmy (you get to pick your seat so its a no-brainer for me)
$2500 premium economy. you get a 2" bigger seat (maybe) and you get two checked bags (i wont use one, so .... )
$4500 business class (seriously, Noooooo)
I can not see paying $600 extra for premium economy.
$600 could pay for:
an increase in the length of my trip by 3 to 5 days, or
4 to 5 half day guided tours, or
3 to 5 Michelin Star Dinners for two, or
20 to 30 Nice dinners for two, or
50 to 60 lunches for me, or
50 or 60 bottles of good Hungarian wine
300 local beers in a pub, or
1/2 to 2/3rds of the cost of the next flight to Europe (shoulder)