Quality of life request.
Right now, we're limited by the max value of a signed integer when carrying the necessary fee to get the MVP NPC to spawn a specific boss. (Up to a 100 times per character, equivalent to 2,000,000,000, or the most money the Coin Exchange NPC will let us carry after exchanging the maximum allowed amount of coins.)
For those of us who grind a specific boss for their card, this means moving around money to make room, and then spreading out funds between characters who will then interact with the NPC.
Given the current fee of 20mz for a regular MVP, making it cost 20/4 gold/mithril coins instead means we don't have to think about moving zeny around or having multiple characters carrying 2b zeny each at the ready to make the most out of a single bubble gum.