Agree about Banksy who of course was sponsored by Hirst also. Love the fact he still hides beneath the mask.

Here is a little on the shark thing from wiki.

"Because the shark was initially preserved poorly, it began to deteriorate and the surrounding liquid grew murky. Hirst attributes some of the decay to the fact that the Saatchi Gallery had added bleach to it.[5] In 1993 the gallery gutted the shark and stretched its skin over a fiberglass mold, and Hirst commented, "It didn't look as frightening ... You could tell it wasn't real. It had no weight."[5] When Hirst learned of Saatchi's impending sale of the work to Cohen, he offered to replace the shark, an operation which Cohen then funded, calling the expense "inconsequential" (the formaldehyde process alone cost around $100,000).[5] Another shark was caught off Queensland (a female age about 25-30 years, equivalent to middle age) and shipped to Hirst in a 2 month journey.[5] Oliver Crimmen, a scientist and fish curator at London's Natural History Museum, assisted with the preservation of the new 1.92 metric ton specimen in 2006.[5] This involved injecting formaldehyde into the body, as well as marinating it for a fortnight in a bath of 7% formalin solution, consisting of water and dissolved formaldehyde gas.[5] The original 1991 vitrine was then used to house it.[5]

A philosophical question was acknowledged by Hirst, as to whether the replacement shark meant that the result could still be considered the same artwork. He observed:
" It's a big dilemma. Artists and conservators have different opinions about what's important: the original artwork or the original intention. I come from a conceptual art background, so I think it should be the intention. It's the same piece. But the jury will be out for a long time to come."