How could a harsh condition compare to the ruin of the Monchi Family? Monchi came with the intention of giving all their magic materials to the Gilded Rose. As long as Mafa Merlin took them, he wouldn't bother the Monchi Family.
This was an unspoken rule between the major powers. It was the same for everyone, even if Mafa Merlin overtook Solomon as the strongest mage of Thousand Sails City.
Otherwise, which force would dare to have dealings with the Gilded Rose?
"High Mage Merlin, the Monchi Family is very sincere about this cooperation. We can take our time to discuss the payment if you are in a bind. It is just as High Mage Merlin said, we are forces from Thousand Sails City, we should help each other. I think that after this collaboration, the Monchi Family and the Gilded Rose will have many opportunities to cooperate…"