Key/Chests

Riot,

I know it is all random on what you get out of boxes whether it be champion shards, skin shards, essence, ward skins, etc. However, I have an issue. On my account I do own every champion, so when I purchase with RP 10 chests and open 10 of them and get 7/10 champ shards. I feel like I wasted my money. There is no point in me getting champion shards. I can purchase random champion shards for 1700 IP for which i have over 90k IP as of now. Is there a way you guys could work on giving the people who own all the champs more success rate at drawing skins, ward skins, essence, etc?