You always see movie villains with one at there secret base, and one day I will have one. How much do you guess it would cost?
If my memory is correct - in the Bond films the most often seen shark species is the Tiger Shark. And many Bond villians often have them in large tanks. Although the sharks themselves are actually only small adults or sub-adults.
But if you also think it about most Bond villians (especially in 60's to 80's) tend to be multi-millionaire megalomaniacs, bent on global destruction or global domination. So that's not exactly a good model for a private shark aquarists.
Keeping a Bull Shark or a Tiger Shark should only be left to the very experienced professionals. Since they definitely aren't suited of any private aquarist.