Everything I make is released as soon as it's finished. To save all users the utter drudgery of hunting for missing assets, I put everything on the DLS and they are always for free. The fact that I generally don't want anyone to publish clones/reskins of my works doesn't make me stingy.
And I applaud you for releasing all your creations and for putting them on the DLS so that we don't have to hunt for them. You are perfectly entitled to place whatever restriction you want on your work, it is your sweat, tears and time after all.