No one in their right mind would deny you the opportunity to buy at 50% off! LOL! Heaven only knows I'd have caved!
I promised myself I would buy no fabric unless I really needed it for a specific project, and I've been able to keep to that. I think buying NO fabric is a waste, unless you have the stash of the century tucked away! I have been able to buy the one fabric that allowed me to use 4 fabrics from my stash for a nice quilt. I also bought a little more of another fabric so I'd have enough fabric to finish a quilt. I think this is only common sense, at least IMHO.