I think having more ideas than you can write in one lifetime is the curse of every writer. or blessing. Depends on your POV. There are things on the harddrives of about three of my old computers that will likely never be posted anywhere. But, I'm sure the experience of having imagined them, of having put pieces of them down on virtual paper, is good for the stuff I do post.
Anyway, I'm glad you shared these glimpses of your DM/HP fics with us. I enjoyed them quite a bit.