10 ref at 2 keys per 5 ref (which is often how keys are sold) is 4 keys. You can't say that a change of 2 ref still keeps the key range the same... That's over two thirds the price of a key you're completely discounting. 4-5 is a nice range, and I see a lot that want 5 keys but aren't selling. The ones that sell are within the range normally, which is why I set it this way.