Mr. Krabby blew a chance to franchise to the surface world.

If Krabby and Burger Beard had any real sense they could have franchised Mr. Krabby's restaurant up into the surface world and if Burger Beard could consent, he'd be Krabby's partner handling the surface world franchise.

If Krabby had seen how much the human's enjoyed his burgers he'd have jumped at the opportunity!