Thanks, but I have one question. If thanking a post gives you 10+ rep how much does "adding to a user rep" give them? Or is that based off of rep power also?
Adding to a users rep gives someone twice your rep power, so people with higher rep have a greater effect on the forum rep system. It's a way of rewarding people who have earned their rep by giving them a way of showing their support of people on the forums, (or disapproval if -repping).
If you have 800 rep you have 4 rep power so -repping will remove 4 rep and +repping will add 8 rep.
If you have 5000 rep you have 25 rep power so -repping will remove 25 rep and +repping will add 50 rep.
If you have less than 200 rep, your rep power is 0 so -/+rep does nothing, but I think you need 50 posts before you can use -/+rep anyway unless that's been changed.
Edit: Oh yeah. Thanking may add +10 rep but Groaning doesn't affect rep at all. So if you disaprove of a post (not necessarily disagree, but think the post isn't worthwhile), feel free to groan but it might piss people off