What Exactly is the Purpose of the Museum Lot?

I keep the one in Willow Creek because it's set up the best. I've replaced most of the base game paintings with ones from packs, and added doors to go outside to the decks where I have a bunch of easels set up. (I agree it's a pain to go into B/B to clear the easels.) Since I usually have several Sims that go for the Painter aspiration (the reward not just lets your Sim paint emotional paintings regardless of mood, they can also write the emotional books so I have my intended writers complete it, usually when they're in their teens) a museum is a necessity for my game play.