The intent is to provide players with a sense of pride and accomplishment for unlocking different heroes. As for cost, we selected initial values based upon data from the Open Beta and other adjustments made to milestone rewards before launch.
This is a true testament to the evolution of writing. In fact, seeing people laugh at Hamilton back in makes me laugh at them in 2016 now that it's a Grammy winning, Pulitzer winning, and world movement today. (Hamilton: An American Musical)