For instance, it has been estimated that the global app market,
which requires credit cards, is worth US$ 3.8 billion right now.
However, one single ringtone, Crazy Frog, made its creators a cool
half billion back in 2006. (Source: one of those huge Tomi Ahonen
articles under “Missed the app store”.)
Thus, four years ago one successful ringtone that sold for more
like 9 cents than 99 was worth one-eighth of this year’s entire
app store economy. It was so successful because it wasn’t
dependent on those silly credit cards and could reach all people
with a mobile phone.