Having some more detailed profile is not the main point. What would be great is if people in need of a job could add a little symbol ("*" or whatever else you want) that appears next to my name on each of my posts.

If I'm currently laid off and looking for a job, someone may read a smart comment I make, then notice: "hey, this guy is smart, and he is looking for a job? Let me check his profile".

If you just have the profile part, it's inefficient. When I want to hire someone, I'll keep looking at profiles of plenty of people not looking for jobs, and I'll miss the ones who could use the help. And if I browse resumes, it's not connected to their comments (at least not in context of a thread), so I don't have the impulse to like them.

An alternative would be to sort resumes by karma, but it's kind of orwellian...