It's all about your reputation level and how many times people click the star to add to it, mind you there is negative settings yet there is no negative star to take away from a members reputation
Here are the levels..
REPUTATION LEVELS:
User is infamous around these parts -99999
User can only hope to improve -50
User has a little shameless behaviour in the past -10
User is an unknown quantity at this point 0
User is on a distinguished road 10 (new users start with this level)
User will become famous soon enough 50
User has a spectacular aura about 150
User is a jewel in the rough 250
User is just really nice 350
User is a glorious beacon of light 450
User is a name known to all 550
User is a splendid one to behold 650
User has much to be proud of 1000
User has a brilliant future 1500
User has a reputation beyond repute 2000