Seems like it's high, but my ads are on the bottom of the screen and no where near touch points, so I'm not really sure why that game is so high. I would never intentionally put ads in a place just to profit off them, it's a fast way to get really bad reviews and games pulled from the marketplace. I discuss it in detail in my course.
The game has 30k installs and has been around for over a year. It averages over 300 installs a day and about 150 uninstalls.
The game has been on the marketplace and untouched for about a year. It the amount of installs rose month to month. Based on some of the reviews, it seems it gets a lot of use in other countries for people starting out learning english.
Here is a screeshot of the game with the ad.
http://screencast.com/t/fHF5pVbOe4