I don't even understand how OP's argument could be considered unfair. 1 materia = 1 infusion. regardless of the grade.

The more low tier materia you can do, the less gil it will cost you in the end.

That said, assuming you pick only 2 stats each for sword and shield, and cap at least 1 of them per weapon...

You will probably have spent just as much (mb prices notwithstanding) as any other novus player.