As far as I know,
You get 10tc for every win on an official server.
Unless you have a booster, you don't get any toricredits for a win on an un-official servers (servers that players create).
I think on Promo servers such as the Wrestling event servers, the rewards for winning were 15TC, at least that was the topic on IRC for a while.
This kind of questions should be in Rapid Threads.