I'm just starting in the Biz end of the game, but...
Did ya'll peep this statement?
"Putting a price on your beats can be tricky. You want to sell your beats for what you think they are worth. Remember, all beats are sold exclusively, meaning you will not receive any royalties for the success of any material sold. Beats can be sold for as little as you want, to as much as you want. "
If you sell your joint for a few dollars and the jawn blows...you get screwed. That's bad business, no matter what 'exposure' you might get.
Just my modest opinion...
Peace.