Kevin O'Leary has no problem with romance—but he has a big problem with joint bank accounts. In an interview with Moneywise last month, the "Shark Tank" investor was asked what he thought about financial gurus who encourage married couples to combine everything—savings, credit cards, investments, even financial identity. His response was blunt. "That's the stupidest idea I ever heard. It's moronic. It's a very stupid thing to do to yourself," O'Leary said. "Anyone who does that is crazy. Don't do that." ...