A big problem with the comparison between big box stores and app stores regarding exclusives is: I can go to Walmart, buy my “Walmart Exclusive(tm)”, and then not go back. Chibi-Robo! doesn’t require I play in Walmart, and, in fact, will run just fine on my DS everywhere. OTOH, for an Epic exclusive, I can’t buy (read: license) the game and then never use the Epic launcher. Because every time I want to play “Epic Exclusive(tm) #9001”, I need to have the Epic Store running.