Honestly, I hate to say it, but I'm rather put off by these prices. Pretty much every hero I have a more-than-passing interest in (except Annie and Tristana) costs Legendary IP. At ~75 IP for a loss and ~110 for a win, with games typically lasting anywhere from 45 to 60 minutes, I earn, on average, maybe around 100 IP an hour. That means it takes about 30 hours of playing for me to gather enough for one Legendary champion. With approximately half of them now being Legendary.
And now a few of them cost over 6,000 IP? 3,000 was high enough! Not everyone has played so much over the last month that they have 100,000 IP saved up, you know. How's a new player supposed to feel when they read about or play against Anivia and decide they really like her, only to find that it would take 60 HOURS of playing, buying nothing else, just to unlock her? And heaven forbid they save up for Anivia and then aren't good enough to handle her. They'd never know, since she's not even on the free rotation.
And this is just my personal opinion, but the RP prices for individual heroes are about double what I'd be willing to pay for them. If it was more like $1/$2/$4, I could maybe see myself occasionally dropping $5 for something like Malphite and Morgana, or caving and paying $4 for some new Legendary hero that looks really fun. But at over $4 and $7 each for the Epic and Legendary tiers, it'll never, ever be worth it for me.
If it wasn't for the Champion's Bundle announced a few days ago (which thankfully includes all of my must-have Legendaries except Cho'gath and most or all of the ridiculous 6,000 IP champions at a price I'm actually willing to pay), I'm not sure if I would've stuck with the game after this. I'm worried that you guys are going to be chasing off potential new players by flaunting 30-60 hour IP debts and individual champion RP costs that leave the "micro" out of "microtransaction". Adding a wider variety of bundles might help somewhat if they're discounted heavily enough, but as of now, I think you're expecting too much out of your potential player base in terms of both patience and money.