It does take time, but like Ashgarth said; there's really no need to buy anything.
I actually DID realize that I can double/triple bond some HQ gear, and make pieces slightly better than Dungeon drops at any given level, but the amount of money and work... nobody is going to pay for it when you'll be gaining 4-5 levels by afternoon...
I guess Materia is the only market that's going to be decent until 50, it seems to take forever to spirtbond past 30
