WHY Riot

So I've owned every champion for a while now and i was wondering why is that i even play anymore playing with friends is fun but i have no incentive. I have 50k blue essence and nothing to spend it on except the next champ every couple months you think you can make something worth in game currency so that way i have something to work for or spend it on. I say chromas so that way you make people wanna buy at least the skin but changing the skin color shouldn't cost us extra money that we've already paid that would be a good trade right? Or maybe make all skins cost blue essence just a really expensive amount give me a goal to wanna continue to play please.