I'm debating just how feasible this is, and if it's worth even keeping my dated tools to try max these out for materia creation. Based on the sizeable amount of XP required for this, I just don't see this happening unless I mindlessly grind on these max'd out classes for the sake of materia only. Now I wish all my R50 craft classes were R48 lol.
I'm not all that familiar with materia as of yet, but I imagine I have the best chance of creating DoH materia from DoH gear, so, if in fact, I'm correct here, this really sucks for those of us who have already capped crafting classes.