For me it's all about slow boating out at night so that you can be on the fishing grounds at dawn. It doesn't matter if the fishing ground are at the shelf or 50 miles. Plus you get to save some fuel that way.
But I'm not sure I'd do it if there aren't good places to sleep the people not on watch.
I have overnighted offshore from the Vancouver Liberty ship all the way to Hoover and many spots in between. Most of my overnights have been inside 100 miles and had many very productive nights of fishing. Nothing beats a big YFT at night though, which generally means you're past 100 miles.