I think in this type of game the devs/publishers can do as they please and not worry about the income. This isn't an mmorpg, players are not content, so you don't have to want to keep f2pers in. Whales wont suffer from the lack of f2pers, so there isn't a reason to have them, they are just taking space on your servers and don't do anything in return. Make them want to become whales, if they don't want to you don't lose anything. The prices do sound ridiculous, but the game can be pay2win as much as they want it to be and nothing will change that.