Fabric for the Craft Show

Wouldn't it be fun if I sold fabric as well as my finished projects at the craft show?!?  I have been keeping my eye out for good deals at Joann's fabrics.  According to my calculations I could spend up to $4 per yard on fabric (preferably $3) and sell for $6.50 - $8.00 per yard.  

I recently found out that actual businesses do this for their fabric stashes.  I couldn't believe it.  Why would a store with a business license and everything not go through a wholesaler?  Is it the cost of shipping, I wonder?  Does anyone out there know?

Anyways, I found these fabrics on clearance/sale.  The packaging is pretty basic.  I'll have to experiment a bit to get it looking amazing.