Well it is at least understandable that DAN excludes this kind of incident from their travel insurance. First it concerns quite a minority of the diving community with a higher risk of accident and second the costs can be quite significant. "Hi dude, I got a hit on a prep dive for a 20 people expedition on the other side of the world, please refund everything" has no place in a general purpose insurance (it would make "ordinary divers" subsidize extreme diving) , it can be insured but this needs some specialized underwriting (and I'm sure DAN would provide an appropriate quote, once the dive plan and so on is submitted).
Their policy seems to be : if you get a medical/diving problem we'll cover the costs in any case (and they can run high), not covering a potential thousand or so in lost hotel reservations if you were into tech/solo diving seems fair game to me. And if you organize a super-expensive expedition, getting specialized insurance coverage, on-location medical staff and so on is part of the organization.
Their policy seems to be : if you get a medical/diving problem we'll cover the costs in any case (and they can run high), not covering a potential thousand or so in lost hotel reservations if you were into tech/solo diving seems fair game to me. And if you organize a super-expensive expedition, getting specialized insurance coverage, on-location medical staff and so on is part of the organization.