I have no problem getting rid of workouts that just don't float my boat.
I've sold CTX, Rythmic Step+, IMAX2/Cardio and Weights, the Beginner step and Step Circuit (fusion?) DVD's, and some others. Mostly step cardio that I find too high impact or to torquey for my tastes. I also sold quite a few of the step tapes I had on video when the DVD versions came out.
With the exception of cardio and weights (and it lost out because of "Buttercup"!), I don't get rid of any of my Cathe weight workouts.