Yes, I apologize for that, when I first posted I didn't know where this bonus came from. I asked in chat and he didn't answer me. It wasn't until I sent the mail to them to close my account (after I'd already blew through my balance) that they even mentioned a tournament win - at that point I thought that they had given me a bonus on TOP of the $100 cash prize. Even the mail I received didn't say anything about a tournament win - it just said "Great News! Your account has been credited with a bonus." It wasn't until I confirmed that my account be closed that they clarified that the $10 bonus was from winnings from another tournament.
Anyhow I guess it's my own fault, if I wouldn't have been pissed off and playing stupid I might have been able to make playthrough and cash out anyhow.
Oh...no need to apologize. If not even the CS knows why they have credited the bonus, how should the player know