How Much MONEY Does Plankton make?

How can the smallest guy in Bikini Bottom fund some of the biggest schemes? I mean, Plankton is a walking contradiction. He’s the owner of the Chum Bucket, a restaurant so unpopular it makes tumbleweeds look busy, yet somehow, he can afford giant robots, state-of-the-art gadgets, and a wife who’s literally a supercomputer.
How does that math add up?