> See also: displaying unfinished sketches.

Depending on the artist and the sketch, I'm quite happy to see it also. Sketches can provide a lot of super interesting context about other works. And sometimes they're quite good by themselves.

There's also no "value" in watching, say, Novak Djokovic practice his serves. Unless you care about tennis, in which case you'd probably watch with rapt attention.

Same thing, basically, for sketches by good and/or important artists.