Just to add a little of my personal brand of logic to this...
If you want to seriously do HNMs like Fafnir, you'll be required to get some sky gear as well if you want to lower wipe chances signifigantly. Just the same as you'll be required to reach level 75. FF is designed to be a nearly never ending time sink. You want to be level 75, why? Just "to do it"? Well what do you gain? Does being 75 = more gil? As most people have realized, no it does not.
I say just let people do what they want. If they enjoy endgame, they'll have to pass through sky just like they passed through level 1-75 to get onto bigger and better things.
If you'd prefer to sit back and make gil, that's your choice as well, ya can have fun trying to buy abjuration off some LS or buy an Osode off a bazaar. It's just a game have fun however you want to.
For the most part I think everyone should just stay out of everyone else's business unless it directly affects you. Just like I myself find romance movies stupid and boring, I don't wait at the exit of some theatre trying to criticize everyone for their choice to go see them.
That is to say, being right factually doesn't exclude people from the laws of common sense.