Because it's a perfect competition market and there are no significant differences between players, they all offer the same catalogue and almost the same user experience.
Personally I Think Paul Graham is very under appreciated, his legacy on the Startup ecosystem and zeitgeist will probably only be recognised many years on the future.
It's a great pity that he doesn't write these wonderful essays for some time now.
Wonderful story Thanks for sharing it with details and updates.
A little question is funding the current bottleneck for your growth? If you receive $X Million how would you spend it to increase the growth?