It is very telling that many of the richest sharks to appear on "Shark Tank" are not regulars, and often aren't people you may think of as "business people" at all. A prime example of this is the next shark on our list, who visited the tank once in Season 13: Kevin Hart. Hart is known mainly as a professional standup comedian, actor, producer, and creator who has built a massive career in entertainment over the past decade. He has been featured in countless blockbuster films such as "Ride Along," "Get Hard," "Central Intelligence," "Jumanji," and has also made several popular comedy albums. Hart consistently sells out stadiums to perform his comedy live, and has gone on to host and produce shows across his own company under the label Laugh Out Loud Network.

Kevin Hart may not be someone that comes to mind when you think of millionaires, but he is one of the wealthiest guest stars to appear on "Shark Tank" so far — with a net worth of around $450 million, he consistently ranks as one of the most financially successful comedians of all time. His guest role on "Shark Tank" was unexpected for many viewers, but also enjoyable for his humorous commentary and interesting investments including a sea moss startup.