Guy:
I think most any reasonable person thinking it through would conclude there's likely some elevated theoretical risk. Then again, we undertake some elevated theoretical risk when we dive, vs. staying on the boat.
I've read some of the postings about concerns regarding predator behavior at varied places, presumed due to lionfish feeding, for example. Predators includes sharks, grouper and even barracuda in such discussions.
That said, chummed shark dives are not new, and seem to have a good success rate. Let's say for sake of argument that someday someone does get seriously bitten; perhaps an arm or leg badly bitten, considerable blood loss, fast exit, rushed to the hospital, graphic wound photo in a thread about it posted under Accidents and Mishaps.
Is that going to prove chummed shark dives are wrong? Or too dangerous?
We've just had a big discussion in the Eagles Nest thread about keeping sites open to cave divers, despite some occasional deaths. This is a somewhat like situation. The possibility of a non-shark dive diver getting nailed would be a bit different, granted, but I would think the risks would be much greater for those doing the chummed dives, and thus far, they seem okay.
The drunken driver analogy you put forth is a good one. Yet many of us have driven while quite sleepy at points in our lives, despite perhaps similar dangerousness. Unless and until we have more hard data on shark dive risks, perhaps proceeding cautiously is a good policy?
I'd like to dive with the lemon sharks someday, and see them up close. Now, one bumping into my body deciding whether to take a bite would be somewhat upsetting...
Richard.