No Disney isn't doing anything wrong. They can charge whatever the market bears. I'm believe in capitalism I have no problem with that. Where I disagree with you as someone that has cruised other lines is that they are head and shoulders better then other cruiselines. They offer a unique product that appeals to kids and families. As far as food and service there's not a big difference.
You do have to understand for a lot of middle class families that could afford it a few years ago and can no longer afford it it's very disappointing. The markets up my 401k is doing well, I've gotten raises the last few years, but inflation out paces all that. To you maybe being selective means being cheap. I don't consider any cruise on any cruise line cheap. A lot of families can't afford to vacation at all so keep that in mind.