Rav Wolfson said: A yid that believes that hashem can give him Parnassah is 6 days , does not need to have his online business running for 7 days.
He also doesnt totally understand how it works by that statement, you cannot turn off Amazon Fufillment for 25 hours, Which is how the real money is made on Amazon
While some people like B&H run their own website, most people use Amazon, ebay and Wal-Mart which work differently