I've been following this thread for a while and its obvious after so many pages of responses, some of which are quite vigorously argued, that we'll never come close to a consensus. However, its strikes me that many are making affordability judgments, not what I would necessarily call value judgments.
Value judgments are just as subjective of course. What really is "value for money"?
Nevertheless, for the sake of pondering. Imagine that you were granted a magic wish and money, though present, did not need to be a consideration when booking a seat. Money still changes hands upon the booking, but whether its cheaper or more expensive is not a bother because its like the difference between ordering a cheeseburger with extra cheese or not. The cost is not the bother, its a matter of whether you actually like that much cheese.
In all other ways things are normal. So, your ethical and other 'value' judgments, as a function of your personality, are the same. Buying an F or J ticket today won't shorten or cheapen your experience at the destination nor will it restrict future travel opportunities or cause problems with the house mortgage ... none of that.....its simply, do I want more cheese with my cheeseburger and is the extra 50c good value for that additional cheese? With limitless cash for 50c upgrades of cheese for your cheeseburgers, would you eat twice as many?
More of everything is not always better, nor is being more frugal always more responsible.
Any other conversation may be inherently flawed because it is masking the so called "value judgment" with our own personal financial positions, its not so much a value judgment as it is an affordability judgment. Not everyone with essentially limitless cashflow buys everything thats on the top shelf - Warren Buffet until relatively recently reportedly drove about in a 20 year old Chev when he could clearly afford a new plush vehicle any moment the whimsy took him.
Now, without showing my hand at all, as I'm trying to be as neutral as one can be with comments like I've made above - I ponder the relative cheapness of flight in any class. 18 years ago or so when I took my first overseas trip to the middle east it cost me then within a few hundred aussie dollars of what it costs me now for the same trip despite vastly better planes, cost of living has multiplied several times over, wages in general, not only my own, multiplied again.
Given the number of days of my labour I needed to save to buy the Y ticket to Jordan back in thr nineties, compared to the number of days I need to save for the same ticket now, shouldn't I be travelling J all the time? If not, why not? Is flying better 'value' now? Or was it just particularly bad value then?