I was speaking to a nice guy today and we came to the conclusion:
It might be nice if there was a NPC that require some item and increase the chance in slotting Weapons and Armor. Just by a few % or double the chance.
I agree with this. So much pain and misery went into those things trying to +7 some of those S-rank slotted gears. that's like 9/10 chances of failure (in a single slot attempt), and all my money keeps drifting away into nowhere.