I like the idea of hatching sharks but it's really risky. It can take over a year to achieve and there's no guarantee that every egg will hatch. If I was you, I would get three eggs at first and see how many produce healthy babies. If the result isn't what you want, you can always change your system before adding more sharks. Honestly I would do the same thing if it was legal here.
Rule number one: Always research a fish before you buy it.
Rule number two: Always cycle your tank.