A mobile gaming peripheral by the name of "Ringbow" hit Kickstarter recently. The bluetooth-enabled device features a D-pad on its surface, potentially solving the "pesky touchscreen D-pad" crisis plaguing some mobile games, such as platforming titles.
A $45 pledge will put one of these Android and (soon to be) iOS-compatible rings on your finger, along with a small collection of games developed around the peripheral. Pledging $55 grants developers early access to the device's API. Ringbow will go into production if the project meets its $100k goal by July 22.
/s
Until the android games gain more depth, better quality & remain totally exclusive to the ios/android market, no one will see much reason to purchase.
Like someone mentioned above, casuals don't care for precision to tough, as oppose to someone slightly more "hardcore", who's concerned with landing the commands precisely.
Even myself;
I play some of the toughest of games on consoles, but I don't get too involved with android/ios games. Sometimes, I don't care to finish them or to get "medals", "trophies" or whatever rewards the game is offering.