It is how many credits you have won since you have been a member of WGT. This includes the credits awarded when you advance in the tier system + any credit you have won in ready-gos and other tournaments and the value of any prizes you may have won. But what they do for you is nothing except they are included in the credits you have to spend if you have not already spent them. The career earnings on your profile is only tells you how much you have won but like I said earlier they are included in the credits you have to spend. Unless that is any value of a prize you may have won. And career earnings can show how good you are at the game if they are quite high, Like Bollie, Lee , Jake,Price Priestess Iconian and some of the other really good players on here.