Hi Tex!
Yes and I would not be surprised if other games and app developers are very aware of which buttons to push.
Specifically these free to play games can end up 5 -6 times what a normal storebought game would cost. They hook you with great gameplay just enough so you get into it and then you hit a wall where you have to pay to pay. Things can get out of hand. (so I've heard ...) EDIT was viewing this post in Busy.org not immeadiately visible I already answered this post.