Wait, you mean make the "Starter Pack" (that doesn't contain all the 450 IP Champions) unneeded? How will Riot make their money?
The community knows that these guys are flat broke, because why on Earth would they even feel the need to explain why Riot needs money for the things they do.
We're talking about a company that can't even afford a second server for a country, one for the east and the other for the west. We're talking about a company that finds it hard to believe that advertising that there are three champs they can get for free by following them on Facebook, Youtube, and Twitter and get them easy skins.
Even with this limited amount of money, they always come though. They took the time and resources to make Dominion for us, and allow us the privilege of free RP for playing a tournament we have to win in order to get said amount. They even made a separate map of ARAM, with completely new turrets and everything.
Its also unfair to call them cheap, not when they have to take time to get ready for the LC$ and other events. They finally have a shop open for awesome shirts, knick-knacks, posters, and more. And when you want to be fancy, you can spend some money on a better (or rare) look for you favorite champion (before the meta picks a new one for you).
Luckily we get to play a free game, and have the option to buy champions out of Influence Points. And look how colorful the whole cast is. We have weirdos, freaks, heroes, a king, a demon, and even a talking fish. All you have to do is play for years to earn and unlock them, or play them whenever they might be free. Oh, and if you want to buy a champion on sale, you can buy them for a cheaper amount of real world cash money. Half off.
And when you finally decide to get Runes, you are tricked into buying lots of Runes you'll never use again after you get better ones from the next teir up. And be sparing with how you use them, because you only have 2 free sheets at first. Spend a extra 6,300 IP for other 18 when you feel like it.
Don't worry that Season 1, 2, and some of season 3 have everything and say it doesn't mean anything, because they're right. Its seriously okay to not have the full champion line-up, nor is it necessary to have any Rune to use for Ranked. If you are a completionist, make sure that your computer is top notch because this game takes a lot out of computers. Battle away for possibly moths at a time. Try and somehow win around 12 matches a day to earn around 1,000 IP a day. Then by about 800 days later, unless Riot has a double or quadruple IP week or something, you'll have the whole champion pool. Then, you can start on your Runes, which will take about another 400 days or so, getting only teir three and the Runes pages. Don't worry, though. Its a free game. You don't need a full champion roster.