I love the romanticized views of Disney. Sorry but it is a simplistic view because it is a simplistic answer.
Why do they do all of this? Because it's the product they sell. And you're missing the fact that a lot of the little kinds of stuff you're mentioning has been lost over the years. They don't do as much of the little stuff as they used to.
As far as why make good attractions? Again, it's what they do. Of course they're going to go the extra mile in making attractions. If they didn't the value would be seriously diminished and the attendance would fall off drastically and they'd make much less profit.
I have never attended a Disney board meeting but I'm pretty sure they don't sit around and talk about how much they can do for the guests. I am sure, however, they talk about things which will bring in more profits.
Again, it's not a knock on Disney, they're a for-profit company. However, it doesn't mean I'm happy about the price increases. Heck, I'm not happy about the price of gas being so high or a gallon of milk being so high or anything else. However, I have to buy gas and milk, etc. And people complaining about that (obviously) has no affect on the price of these necessities. However, if enough people complain, and enough people stop going or spending as much, Disney will listen because profits will be down and the stockholders will ask why.
While you may not be upset with the price increases I doubt you're terribly happy about them either. Trying to justify them by saying (essentially), it's the price for the, "magic," doesn't help the experience at all.