I will sometimes be very interested in a service until I hit the "about" page and see all the "inside jokes" and weak attempts at humor that, for some reason, make me very uneasy.
It almost makes me feel like an outsider, the guy standing around the circle of cool kids who all have something funny to say, that I won't get, and they don't want anything to do with me. Do you really want your COMPANY to send that message?
The main UI designer draws arrows and likes Ice Cream? Is he 7? What is a data grill master? Uhg. I'm a bit of a stick in the mud, yes, but I don't understand this silly about-page trend.