Honestly though what percentage difference does this make in productivity and is that percentage really going to be the difference between a startup's success and failure? Being fired or not? Being happy or not? If the thing makes you happy then that's one thing. If you think getting 10% or 20% more work done is going to move you from mediocre to exceptional or is going to make you happy, I beg to differ.
Also, they make most people feel fantastic and like they can conquer the world. Is it really any question why people would find that appealing?