the worst of people adding bad reputation is when they use the system as "revenge" when they don't abide with your ideas. Though not displayed I have a red score added by a guy who didn't leave his name but is easily to know it comes from him after I posted my thoughts about the software he uses but offering my help anyway if he wanted to continue using it. At such point it was easier post "I don't share your opinion about X" and accept or decline the help instead of add such rep
There is a dedicated thread to discuss Reputation: http://forums.digitalpoint.com/showthread.php?t=239 Suggest you to go post by post to understand the maths and complexity behind Reputation.
Sad but true, lots of people on here give you bad rep if they don't agree with your opinion or even if you post an offer and they don't like the offer or can't afford it. Am I red yet?
Yea I joined long ago, came back here after sticking to seochat for long time. Members here make alot of sense.