In article , Jeff
Liebermann wrote:

Blundering onward, the Play store has 2.6 million apps available.
About half are free, so that's 1.3 million apps. Average revenue per
app would be:
$1.4 billion revenue / 1.3 million apps = $1,100 revenue/app/year
Not enough to support product development.

the average isn't what matters. a quality app can be *very* profitable.