This is a perfectly valid way to vid! In my younger days I did the same thing! Now, though, after many years and many fandoms and advancing age I don't trust my own memory. My clip library serves two purposes: I re-watch the source again (with no sound! It changes how I relate to the images when the audio dialogue & sound effects & scoring is yanked!) and make notes for myself as a vidder instead of a fan while clipping, and I can search for things I might have forgotten exist if it takes me a few weeks to get back to it.