I cannot believe the hoops you guys are willing to jump through for probably zero reason.
If the people whom you don't want to see the room charges are that Disney savvy, then they already know what the room probably costs--at least a ballpark number. All they have to do is try a mock booking themselves or look on mousesavers or AllEars or even Expedia.
I mean, if someone is that unaware of what Disney room charges are, I highly doubt they'd be rooting around MDE to try to find these things. MDE is unintuitive enough--finding the room charges would require a lot of digging when they could just look on the Disney site and find out at least an approximation of the room charges if they wanted to know. The people here who are advising you are very familiar with MDE and where to find these things.
As I've said above, I'm very Disney savvy and I had no idea this was on the MDE app because I've never looked for it there.
Meanwhile, what is the point of keeping something so easy to find out about--without the MDE app or even any app--a secret? I guess I don't believe in secrets. It seems like a waste of time to me. How about a simple "It doesn't matter what it costs because I'm paying for it so just relax and have a good time"? Or "It's a gift"?