One of the major reasons that companies used to go public is that the public markets provided much easier access to large amounts of capital. The significant capital available from public markets was important to take a great idea and scale it to a level where economies of scale could be achieve
Investors have been anticipating another special dividend from Costco for a while. Costco gave a special dividend in 2013, 2015 and 2017, so investors are anxiously awaiting one just like a kid waits for Santa Claus.