1450 RP. Why not 1350? Why are you making it such an annoying number?
You can't just buy it with 10 dollars. You need to buy it with a 10 dollar purchase, then a 5 dollar purchase. But when you do, that's giving you 2,030RP, leaving you with 580RP left over.
This is an incredibly annoying thing, and it's absolutely annoying to me. I have to burn 15 dollars to buy something that I'm not even going to spend the full 15 on. I hate that so much. It's like going to the store and the cashier tells you that you can't buy this 5 dollar item unless you specifically spend a 10 dollar bill. Not 10 dollars total, an actual bill.
It feels like a pretty cheap way to gain more money.