Absolutely, people who don't have a lot of money - students for example will value a monetary reward. The more you earn the higher that reward has to be. This

Absolutely, people who don't have a lot of money - students for example will value a monetary reward. The more you earn the higher that reward has to be. This would have been good for Uber, since it is an 'everyone' product. So even if someone who wasn't going to spend much in the next year or so signs up, they in turn may refer someone who will.