[demione]

IMO it has to do with the fact that Quora forces you to state your real name and credentials when creating an account. Although certain people will feel this is the way to ensure answers are given by the best possible authority on a subject, it actually hinders the meritocracy of user-driven content. Uneducated but well-informed Quora users may feel it's not worth their time to contribute, because they'll just be overshadowed by someone with better credentials. In essence, it's like paying for a game's DLC instead of putting in the time to earn it on your own, cheapening the experience for all.