Talk:Coin Gun/@comment-27140951-20151130051103/@comment-3157150-20151130075544

One of the main reasons is maximum stack sizes, as well as the fact that the game automatically converts coin stacks to the next iteration in the value sequence. When using Platinum Coins, this is not an issue. Gold is less so, though down with Copper you'd only be able to have stacks of 100, each of which takes up an inventory slot.

Sadly it's not just a matter of efficiency, it's a matter of inventory management too.