I don't think that fits with the spirit of the item, and leans back towards the monkey's paw. What you have to do is make it sillier. If they wish for 100gp, they can take out 1sp from their pockets at a time. If they wish for a million gp, it's a random location each time.

It’s all copper, it’s speeding up, and let’s review the encumbrance rules…