It's also interesting that there are more units capable of playing DSi-only games than standard DS games. I wonder if some devs will use this to avoid some DS piracy since DSi-mode flashcards are much less prolific.
A lot of the final DS games have been 'DSi Enhanced' in some way, pithy use of the camera or perhaps the extra CPU power. However when the game is pirated it just reverts to DS mode, so you can't use the camera and stuff, which for enhanced games who really cares?