Difficulty? Yeah, making 500 of the best materia in game (4.2M each), 500 catalysts (300-600 hours farming), 500 of the gear you want (and of course, the worth of the gear you want is 500k)

This is the numbers for placing 3 iv materias. Please buy this money from RMT and say it is easy.

2100 Millions for Materia
5000*500 = 250000 for catalysts if buying
500000*500 = 250 Millions if buying gear

in all 2.3525 Billion gil for a gear with 3 iv materia.

You go use 3 million dollars on a game, you be pretty dumb. You CANNOT buy materia if intending to use forbidden materia craft.