It was only after they’d sunk $40,000 and nine months of precious nights and weekends that Jordan McDowell and William Bjork realized how hard it is to make a passive income selling things on Amazon.

The couple had hoped to strike it rich—or at least quit their day jobs—buying goods from China and reselling them on the e-commerce site. Instead, they lost all the money in their high yield savings account.

I feel bad for the people that have lost money trying to sell products on Amazon, or any other service, but when people claim to have all the answers to make you successful, it’s usually a scam. Those people never lose money.