I don't like the idea of just str8 out buying your weapon, because like FATE grinding to get it, buying it requires ZERO skill...

instead, for people who have the time to grind, can grind.. but for people that don't have the time ( or luck to get the drops ) should be able to get theirs in some other way... for example I'd much prefer killing EX primals:

the first atma can be FATE grind to open the quest, then it's:
Titan, Ifrit, Garuda story EM (3)
Ifrit, Garuda, Titan, Levi HM (4)
Garuda, Titan, Ifrit, Levi EX (4)

and you can't die, NOT EVEN ONCE.. for if you do you'll have to do it all over again....and it doesn't have to be in that order either, you can pick and choose which you'd like to knock out first and the game will keep track like it does in "primal focus"

some of you might say "isn't this another kind of grind" ... and indeed that might be true, but wouldn't you prefer this over FATEs?