This needn't be the only solution.

As I posted in the materia thread, if there is high-value materia for crafter-only use (e.g. +2 control, adds extra action, etc), then crafter become end-product consumers of these items.

If crafters cannot add AP to items and create these materia, then the prices of these materia will reach truly astronomical proportions. Crafters, with their large gil reserves, will be competing for these items, and the costs will not be passed back to anyone (except indirectly, in the same way as ANY class archetype).

Does this break somewhere?