I don't know where you got the idea that this contest from roobet.com is not profitable. My response is that it can be profitable or it may not be. I'm not saying this just because I'm always one of the participants in this contest. I believe it's profitable because why else would this contest have still running for more than three years (if I'm not mistaken)? If it weren't for this contest I probably wouldn't still be playing on roobet.com.
That contest makes Roobet still known here in the forum and it’s a big help aside from their signature campaign and I agree that if its not profitable or beneficial for Roobet, then they should’ve stop it. Roobet art contest is the long running art contest in the forum with a different theme every Month, I believe Roobet team values the work of the participants and they put extra effort and budget for this.