I disagree with that statement. There is a point at which some people decide that after buying a resource it is not for them or that they just don't like it and won't use it. If that is the case then you are "done with it" and might serve someone else better and help you fund your next tool, learning material or deck. So yes you can be done with a DVD that you purchased."done with it" ?
As a magician, you shouldn't be "done" with anything.