Why Are All The Cool Cases Only Made For Iphone's?

it seems like the most rugged and unique cases are only made exclusively for the iphone. i have an otterbox defender and trident kraken 2 case for my droid x. they both do their job of protecting the phone. but i like variety and options. and it seems like the really unique cases aren't made for anything but the iphone. i like cases like the taktik, the aqua tek, griffin, casemate tank, gumdrop, qmadix xtreme, rokform, etc. i realize the iphones are extremely popular custom phone case manufacturer. but android is responsible for over half of the phones sold. so why not make cases for them and reach more consumers? why limit yourself? does anyone know of some unique rugged cases for the droid x?