I like to leave it on when I'm on shore power so I don't have to keep emptying it every sunday and waiting for it to cool down every Friday. It's nice to keep non/semi perishables (ketchup, mustard, pickles, mayo, jelly, etc.) in there and not have to keep hauling it back and forth. Plus I make sure I leave a few cold beers and sodas on Sunday when I leave in anticipation of my thirst levels the following Friday.
This way I can load the boat, crack a coldie, then start putting stuff away.