There's a time and a place for it, but small lakes are where it gets and should be contentious. I'm on a long/narrow 200 acre lake, and I'd say it's the bare minimum size where they can safely operate without being complete jack-asses, so long as they stay down the middle. Once they lean towards either shore, it's game over for the shoreline here. I know some will argue that storms can do more shoreline damage, but I'd say that's really only true on larger lakes. I'm on the north end of ours and basically get the worst a storm can dish on our lake. If a surfer runs parallel to my end, it's far and above bigger than anything I've seen winds/storms kick up, and also has much more energy to it. Thankfully, our launch is pretty shallow and deters most of the bigger boats, so we really only see 4 surf boats (and 3 live on the lake), and so far they're all pretty courteous and well versed in skier's etiquette (helps that most of them are pretty serious wakeboarders - so they get it).