It's a fantasy role-playing game.

DM: You are Tiberius Stormwind, a dragonborn sorcerer . You are the member of the famous group of adventurers. Previously, He thanks her, pays her, and says  Scanlan sends his regards , making her blush. you goes to the Temple of Sarenrae to pick up his Decanter of Endless Water that he was having Father Tristan enchant.
DM: That would run you approximately 700 gold to create it as a plus-one magical item. Would take one mage a week to do it.
Player: Okay. So I'll do that.
DM: Okay, so for the week it takes, you pay 700 gold pieces. Your quarterstaff with a couple of daggers tied to the end is now considered a plus-one magical weapon.
Player: I stop at Gilmore's and I drop off my Ring of Protection. And pay whatever that is to add a plus-one to make it instead of a minor, an actual Ring of Protection.
DM: Unfortunately, the thing is, an enchantment cannot be progressively enhanced. You would have to disenchant and then re-enchant the entire thing.
Player: I thought Gilmore said they could do that there, before. That's why I was going to cough up the green for the Gil, as it were.
DM: No. They can enchant the item with it, but it would be the cost of basically re-enchanting the item.
Player: How much would that be?
DM: That would cost approximately 25,000 gold pieces.
