Withdrawing immediately if getting black?

I've noticed a few players who just withdraw from the game immediately if they get black. Not resign, but somehow back out before even getting started. At our level (500-600) the victory comes down to less blunders anyway, so seems pretty petty. But it makes me wonder. Do you get more points from winning if playing black? There should be some small bonus, or I can't really blame the people who withdraw immediately too much.

No. They are aborting and if they do it often, they lose the ability to do it. 

Your stats say you have played half of your games as black.

Does that even work? I'd imagine that you're not always assigned your colour based upon equal random chance.