* Top5 get points to be ranked in a monthly leaderboard, they'll eventually get paid depending on their ranking in that leaderboard.
* Winning/ranking good will help you get a position in a review board to review other submissions and then get paid.
* You still can participate in bugraces, which generally doesn't take too much time (hours or even minutes) and get paid accordingly.
This is just a small portion of how you can make money. Granted, it is not easy, but if you're good, well, you are good.
Gain exposure? Working with big clients, AOL, ferguson, lendingTree, and a lot more - Plus, If you have a job interview, you still can get a recommendation from TopCoder with a list of your winnings/projects (it's visible in your profile anyway)
I'm speaking from experience here, It's so wrong on many levels to put all crowd sourcing websites in the same basket.
So, are you pleading for the designers' "fear" of this crowdsourcing trend, a fear based on their time being wasted because designs from other people may be better (for any subjective definition of the term)? Are you honestly saying with a straight face that designers should be awarded for any and all their efforts regardless of the quality of their work?
I'm sorry, but they should just suck it up and change. Like the world around them is.
PS: I don't remember the last time that people rewarded me or anybody else just for trying. Perhaps kindergarten, but I have no clear recollections of the daily scrums in there.