But it is indicative of the value the site's users have received from you over time.
Reputation is difficult, and I can't think of a good way of doing it, but SO's way is not really any worse than any other site. And it's a lot better than counting "likes" on Facebook.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.