We use to do that-- a lot

But it's against the forum rules now. 

I'll give ya an example-
I need a new top Banner for my site. We use to be able to post a little forum challenge and give away one of our store products as a prize.
Not anymore!
It has to be in the contest forum and is too big a hastle and time comsuming to get it all set up ect....
To formal and far to tightly regulated.