Crafting is used as a steeping stone to get the best gears in a game. It is fine as is. There would be little motivation to do endgame content if you could just buy the best gear from the market boards.
The thing is, the way penta-melded best-crafted shit is at, it costs millions, think 1-2 millions per piece, IF you're lucky and spiritbond your own more-pricy stuff (like crit and vit materia), takes way longer than just token myth gear to get, and is only slightly better.

That's not a "stepping stone" gear to the top, given the effort it takes. To many, it's the top. It might not have the best stats, but it comes with a sense of accomplishment, bragging rights and other stuff that "raider BiS or game sucks" people will never understand.