16 times is too much , that means they didn't make money from it .
Too much! LoLz... nothing is too much in gambling, as long as it is balanced with odds, which is pretty much the case here.
And I think people will rarelly play a game with 1/16 chance to win.
Gamblers are not so dumb that they'll place a bet on a single option. By betting on multiple options in a single block, they'll increase their chance of win.