You really aren't getting the point. There is a difference between Disney actively making that decision through say Guest Relations making a guest happy who had a bad experience or to make someones trip more magical. What happened here was not that. I guarantee you there was not a decision made to let anyone and everyone who wanted to go get a band so that profits would go up. They make a ton more off the person paying almost 100 bucks to be there then letting everyone in for free who isn't going to actually spend a ton. This isn't Food and Wine where a large draw of the event is getting in to be able to pay to experience it.
MNSSHP and
MVMCP is about the parade and other "free" thinks like stage shows, candy, cookies, milk etc which Disney need the majority to be paying to experience or they'll end up not making any profit off the parties.