Big time investor Kevin O'Leary is the "Shark Tank" panelist entrepreneurs pitching their businesses on the show usually find the most intimidating. A longtime venture capitalist, he's been sarcastically dubbed "Mr. Wonderful," and he told CNBC.com that he lives by a simple creed—he likes to work with entrepreneurs, he likes to own their businesses and he likes money.
"I'm a capitalist," he said. "I'm hard core right wing, slightly right of Attila the Hun, and I believe that money solves a lot of problems in life."
In his years as an investor, he's heard it all and he's seen it all, including a pitch from a woman seeking capital for her love and wealth elixirs. But he's not as concerned with the product as he is with the three attributes of a successful pitch, and without those, he's not interested.
"Number one, they are able to articulate the idea in 90 seconds or less," he said. "Then they were able to say how they were the right team or person to execute the business plan. … Third, this is in 100 percent of the cases, they knew their numbers. … If you don't know your numbers, get somebody that does, or you deserve the punishment I'm going to give you."
If all three of those criteria are met, entrepreneurs are more likely than not to earn O'Leary's interest. But if a deal is struck and he finds a partner, there's still the small matter of the successful running of the business. So he has one very simple metric that he uses to see if his investment has been worth it.
(Read more: An entrepreneur who once had to live in his car)