I thought when the 'rep' point system was proposed and implemented, it was intended to be used as a guide as to how 'good' or 'useful' someone was with regards to airsofting issues.
Wether it be good advise, being friendly, etc.
What it seems to be in a lot of cases (not all mind, but a lot) is mates patting their other mates on the back, sort of old boy network really. Many rep points are 'they gave me rep point, so here's one back again.', 'Is a really good guy.', etc.
Not really useful as a guide as to someones knowledge or attitude on this site or airsofting in general.