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If you want to see the sharks, dive off a day boat. They congregate at that mooring because the boats feed themor at least they used to, when I was traveling there. I doubt there would be sharks in the blue hole otherwise.I went while on the PH Sundancer in 2009; we saw no sharks and the viz was poor.
Safety issues aside, to me it actually does make sense to bounce down, see the stalactites, say "cool", and head up. Of course, a lot of divers would say the same about the coral reefs I can linger for hours on.I'd like to dive it but in a way that makes sense to me. Doubles and deco tanks. Quick bounce on an 80? What's the point??