Am curious, I remember seeing a talk by Linus Torvalds on the internet where he explains git and how it incorporates a decentralized design to solve some inherent problems that the alternatives posed. Now, why is there emphasis on creating git servers?
My guess is that while some people love the flexibility of a distributed system (lots of different and useful workflows) the average people like centralized. SVN has more market share than Git so far as I know.
tl;dr: people like having less choices, it's less confusing.