why
Dat battery life. Obviously.
It's a good phone too. I guess the only complaints you could make are that there are higher resolution screens available on some other phones but it still has a decent ppi for a 4.3 inch phone. The HTC One X and Galaxy SIII are the Android phones everybody is humping over right now but there's nothing else with comparable battery life to the Razr Maxx.
I have no idea what will happen to Motorola in the future but at least the Droid Razr line will get updated to Android 4.0.