I don't care what you ride, as long as you show respect. Some of the better surfers around here have been known to break out the SUP, even on bigger days.
I believe it, Brew, whether people want to accept it or not, having one will make you a better surfer, or better yet, better watermen. It strengthens your core and legs so much it's ridiculous. All that time spent standing / balancing makes your sea legs stronger and stable. When you switch to a prone board and pop up to your feet, your solid and on really good days your legs don't get tired from riding wave after wave because your so use to long periods of standing / balancing that's it's nothing.