I would be more inclined to purchase gems if I were not constantly losing them by accidentally clicking "play on". I would assume this is an obvious tactic to use up people's gems, having the option clickable without an "are you sure" double check, but you may be decreasing your puchases by having the play on option so easily clickable. I am sure I am not the only person often mad that I am accidentally clicking " play on" and using my gems mistakingly.