Well, if I had the preferred plan, then I'd expect them to cover me.
My comment about snorkeling didn't say anything about the preferred plan though- it was about whether if the guy was snorkeling instead of wading, would DAN cover him. It's possible to snorkel with a beer in your hand. They don't just cover SCUBA dives. It appears their handbook actually doesn't say what they consider an official "skin dive"- so would wading with a snorkel, and sticking your head down to see things actually count (which is how I typically snorkel, whether I can touch the ground or not; I rarely submerge myself), or do you need to be breaking an actual depth limit akin to competitive free diving?
DAN preferred plan isn't really an economical option for -me-, because I have much better insurance available at a much lower cost for non-dive related things.
$35 a year more for secondary coverage (DAN picks up what your primary insurance carrier doesn't) isn't economically feasible for you? Um, ok.