Ok, let me try and explain,
To get + points you need a green rep, you can only get green reps from people with a certain amount of points. The more points they have, the more points they are likely to inflict on you, minus or negative.
To get - points you need a red rep. Same applies about number points being proportional to the point score of the giving member.
Grey reps have no effect - 0 points - this could be positive or negative. If you got a grey rep, all that is useful to you is the comment and how that comment makes you feel. If the person is an "unknown quantity" or below (red), all their reps appear grey.
I think you have to have 20 something points to be "on a distinguished road".