"Shark Tank" star Kevin O'Leary isn't known to mince words, and his take on workers splurging on their daily cups of coffee and work lunches was no exception. "Stop buying coffee for $5.50. You got to work and spend $15 on a sandwich – what are you, an idiot?" O'Leary, also known as Mr. Wonderful, said in a financial advice clip shared on Instagram last week.