This is no joke, such apps really exists:
I guess the one and only rating comes from the author of the app:
The one and only feedback from a Microsoft representative:
Developers are free to set the pricing for their apps.
This is a bad joke!
There exists a feature for reporting a concern about an app (sorry, Screenshots taken from Austria Store, German):
But this seems to be very useless since I never got an answer/feedback …
- App URL: http://tinyurl.com/q7lqymd
- MS Answers: http://tinyurl.com/nteb8la
M$ … just kidding …