Building companies is hard. It takes a lot of luck and impeccable timing. But none of that matters unless you also have great people. Great people usually join companies because of the scope and freedom of their work, the quality of the people they get to work with and the impact of the product they are building. But they also join because, no matter how mission driven people are, they expect to be rewarded (richly, so) through stock options or its cousin, the RSU.