many people give reps to someone who has given them an answer or help to something they needed , could be help on a post or post about something , so this way when u see someone with many reps , there is a good chance it is because he probably has helped alot of people , alot of people are repping his replys , and is more than likely a knowledgeable guy worth taking advice from and listening to . has a bit of experience of what he is talking about under his belt, thats how i take it