Lets take the mog station questions a bit further. Why are there single-character items when they obviously have the ability to make everything account-wide. Is just because you can do everything on one character seriously a valid excuse? Some people like to play on separate data centers, since SE feels its neccessary for each region to have around 2 each.

Lets go even further. Why do I have to pay for separate male/female versions of the same item when the calamity dude used to swap outfits between genders in game?

Most people have hit the nail on the head: Money.