a person who battles their way to stars finals all week and gets 3rd gets 15 karma.. yet some people who joins with a huge premade / insane at challenges / really good at spam racing can get 15 karma within hours in rookies.
i'm gonna keep this short and leave it like that.. its STARS, its the biggest game here.. so yah with this insane karma farming these days, its just fair to change prizes at stars..:')