is this a good idea?

every time i buy rp and spend it i have a little left over, but never enough to do anything with. so my thought is would it be cool to have a RP converter, so that you can turn your left over RP into IP. for example you could turn 1 RP into 2 IP. i feel like this is a good exchange rate, this way it helps a little but would also keep people from trying to buy RP and turning it into IP in an attempt to get more champions for less money. this is just something i thought would be cool. so please let me know what you all think.