Note that repairing your gear cost you even more materials than a normal enchanting attempt.
This is quite wrong, as repairing doesn't require any belt & soul.
That said, 30 attempts on +9 is still
- 375k gold
- 450 Tyrant's Souls
- 120 Tyrant's Belts
- 450 Magic Ingots
on its own, which would be quite a lot of dungeons if it was not from CS boxes.