Most people who buy skips unsub not too long after...
There really isn't much to sustain you here if you've not grown attached to the lore, story, and world.
I see a lot of talk in here about how a booster would be unprepared for endgame content.
You won't convince them of that. But it's true. This isn't WoW. We've got videos of some top end WoW raiders now, who bought boosts, and even with carries essentially spend most of their fights as "floor tank" - the dead guy makes sure the floor doesn't attack anybody by... holding it down I guess.
Before the mass WoW-exodus when people were quitting that because of all it's currently insanity, we also had videos of "raid pros" from WoW who got those boosts, failed at everything, and then quit FFXIV calling it a "dumb game with a story that sucks" (A story they bought a skip past... so actually didn't even know...).
But WoW players tend to think every MMO will follow the same formula, and you can't convince them they're wrong - they need to find out for themselves. If you're lucky, they will find out by actually playing the game. If you're not lucky, they will pay to skip past FFXIV and be at the "stuff that's just filler content here"...
As I said in my earlier post... why would you buy tickets to a movie and then sit in the lobby refusing to watch it until the end credits were rolling?