I had never really given it any though until I started doing gigs, but video files do take large amounts of disk space. Is it unreasonable to charge a client for disk space? For instance, you buy a 500GB hard drive for $100, a certain project takes up a total of 50GB, so you charge the client $10. I know $10 seems measly, but after all your projects build up, you've got to either buy another hard drive, or trash your work.