Champion costs

I started playing this game in early season 6, i played a ton i have thousands of games and i have around 80 champions, i am basically halfway considering how many 6300 i still have to buy, i would really appreciate that the champions in sale would have their cost reduced with IP as well or generally reduce the champions cost both with ip and rp, in my opinion buying a champion for 975 it is not worth as with that i can buy a nice skin.

Let me know what you all think.