Beyond music, videos, and books, how many people actually purchase products from their mobile devices? I know I don't, and have never seen my spouse or any frie

Beyond music, videos, and books, how many people actually purchase products from their mobile devices? I know I don't, and have never seen my spouse or any friends do so, though I realize that's not a scientific survey. Also, if they've only sold 10's of thousands of units as has been claimed recently, that doesn't seem like it translates into many additional sales, even if users are buying additional things on them. At least not compared with iOS or other Android platforms.