Must Own 20 Champions to play Ranked? That's ridiculous!

I've been playing for awhile now and I've managed to acquire 12 champs Which is a good number to own. I've spent alot of IP on the ones I own and I am Not gonna spend more IP just to get some champions I don't want just to play ranked. To be honest It feels like a scam for riot to milk money off money from players to get those extra champions. NOT gonna do that. I spend money on skins not champions. It would be insane. So anyways Can they reduce the number of champions needed to play ranked or at least increase the # of free champions in rotation? It would help alot.
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