Barstool's Dave Portnoy offers investing advice, but reveals one big caveat

Barstool Sports founder and President Dave Portnoy is echoing his past investment advice that "stocks only go up" and "only losers take profits." However, he pointed out one important condition during an appearance on "Varney & Co." on Wednesday.

"I've always said the caveat, if you have time pressure, that's a different story," Portnoy said. 

"But if you're in my shoes, a young strapping man, and I can wait, time is always on your side in the stock market, Stuart, and the stock market has proven it," he continued.