Cant figure out how to do the poll, but I vote no. I have never done a shark dive but I had experience with sea turtles out in Hawaii which lead to my vote.
Feeding does (IMO) alter marine life behaviour. When I first started diving in Hawaii it was popular for the turtles to be fed by the charter boats. It was great seeing turtles up close as someone gave them a squid. After diving there for a while, turtles became somewhat of a "common" sight. What was not common was having to "fight off" the occasional turtle that was trying to nip my white gloves thinking it was squid. I never got bit but my whole attitude towards turtles changed. Instead of a magnificent example of underwater life, they were a nuisance and a potential injury. The educational experience of a turtle encounter was lessened with the worry for my didgits.
My second experience was with a moray eel at Hanuama Bay. I was snorkeling with some visitors and while swimming along saw a 3 foot moray swimming toward me. That was unusal as all the moray I ever saw were either in a hole on the reef or swimming away. This one keep swimming toward me an I finally had to put out a fin and nudge it away. I am only guessing, but as Hanuama Bay sold "fish food" at that time, the moray swam toward me looking for food.
These experiences lead me to vote no.