All champions that aren't new should cost the same IP/RP.
Especially the reworked ones. You see, the problem with weak champions isn't a balance issue - it's a money issue.
Y'all wanna see a bigger champ pool in the LCS? 1.) Riot gives 80% of the community a reason to pay money for the champions they want instead of buying everyone at once with a bundle or sticking with the 450IP champions. 2.) New / casual players drop $20 for a handful of champions that seem cool to them, regardless of who they are, instead of IP grinding. THEN $20 more for their skins. 3.) Riot now has reasons to buff weak champions. In the form of** dollar bills.** 4.) The profit already happened - I don't even need to say it.
Know why it's bad to see Soraka in Worlds right now? Because she costs 450 IP.