Thoughts from a brand new player

[Niwashi]

Hopefully they have it in cash shop one day :/

Pre-order items have a promise of exclusivity for pre-ordering. They're never made available any other way. (The closest was when ARR was released on PS4 several months after it had been released on PS3 and PC. The new platform release led to players getting a second opportunity to pre-order it.)

SE could, however, create other items with a similar bonus. For instance, there's now several hats in the game that provide an XP buff for low-level classes. I believe the Aetherite Earrings are the first to combine that with level-adjusted stats (which make extending it into higher levels feasible), but I'd be surprised if they're the last.