How about a THANKS system to encourage others to help others rather then reply with a sarcastic comment. They have it on AV Forums and it's pretty good. Shows under your post count how many times you have thanked people and how many thanks you have received.
That sounds like a decent idea, but if it works like a respect system - then I imagine a fair few users on here would get instant bad respect from many people... without naming names, there are a few members on here that have rubbed a lot of people the wrong way with posting style and random threads.
The list Spie made seems pretty solid tbh
