Say I run across a vehicle in the garage like http://www.gassavers.org/garage/view/14
But I have no idea who that person is. There is currently nothing I see on that page to give me a clue who the owner is unless they put something in the description to say what their username is. The one I used as an example is pretty obvious but you get the general idea.
Having a link to that users profile would be useful if for some reason someone was to end up on a garage page with no idea who's car it is they are looking at