He explained that if he sold 2BTC worth of tea today, which might equal $17, it could be worth only $8 tomorrow which would cause him to have lost roughly 50% of his revenue from the sale.
Does he take credit cards? If so, he's giving up about 2% of his revenue on every single transaction. If,say, the risk of a 50% loss is 1 in 30 (and it's nowhere near that high), that's equivalent to a 1.7% fee. He's still better off taking Bitcoins than credit cards.
Of course, in reality, the chance of an increase in value pretty much balances out the risk of a decrease in value. If you want essentially zero risk, Tony provides that service.