Why is IP gain so atrociously low?

So I'm leveling a new account and I noticed this since I've been playing on this acc and another for years I had lots of IP to spare. Since I started the new account I'm just now realizing how hard and painful it is to get IP. It would take around 75 games to get 4800 champion. This may not seem a lot but consider the fact with the 120+ champs and still having to buy runes which cost 15k+ it truly starts to add up. Why is it so low? Especially since most casual players only play 1-4 games a day. That's weeks of playing games to get a champion they want to try out and months to completely fill out 2 rune pages.
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