There's going to be an overflow of whatever is the cheapest and 'best' item to Spiritbond and turn into Materia anyways. That's not gonna change from 1.0. Whatever is the cheapest recipe for the highest level to give a certain Materia is going to be spammed and flooded in the AH/Wards.

As people spam quests to level up, they're going to run out of quests for their other jobs, atleast on the new player servers. Most people will be using the various sidequests to level Arcanist only.

I guess if you bring a new friend/returning player into the game, you'll just have to give them gil because they can't use your hand-me-downs. Oh well, we'll discuss this more in the Beta forums.