Useful! Because it is degrading for pay-players to have to mingle with the freeloading plebs and actually go into a realm or something to level up.
/s
The quest chest way of turbo levelling up - before they kyboshed it - at least that had the merit of you needing to have done whatever content to earn the chest in the first place, but they removed that only now to bring in a way for payers to skip levelling completely?
It’s bad signalling to their priorities (“give us your gold we don’t care if you actually play the game”) and, maybe worse, things like this feel like they’re just modding the game, rather than joined-up strategy from the devs/owners.
They just needn’t be so blatant about it. Release some easy tier steamrolly dungeon (eg UDL/Abyss tier) that is fast to run, has a single path, and always has enough minions to give enough XP in a full clear to get from 0 to 20. Then sell THAT key so people buy it as the easy level up option.
And Potion of Max Level, does not count as a potion? Erm maybe calling it potion then isn’t the best choice.
Edit: should add re-reading this, it’s hardly that I feel any need to riot over this item or anything - because it’s only catering to the lazy with a shortcut to save them the 5 minutes that level up takes. Just that it’s emblematic of wrong priorities that Deca instead of making level-up more interesting, they just give players a complete opt-out.