Back in GMS, I would often collect etc drops from mobs, and donate to Chief Tatamo. After being consecutive, and a certain amount of etc was given, he would be generous and sell you magic seed at a discounted price. Dropping the price of magic seed from 30,000 to a lower range. Of course there's a limit to the price. I always thought it was fun to donate, like it's an extra goal to achieve a cheaper price for magic seed ( though I have no problem with the price ). However in MapleRoyals they don't have this option. I don't know if it was intentionally taken out or it's a bug. But I'm hoping if you could add it in. I found some details about it here. (censored link cause the website was breached)
It would be a nice addition, though I probably won't go out of my way to lower the price. There was only really excess ETC from Harps (leech), and maybe Kents. Dragon Forest/Canyon Mob ETC didn't count =/