There's a good video from EEVblog (EEVblog #887 - The Economics Of Selling Hardware) where he suggests a MINIMUM of 2.5 x COGS. But I think that was assuming di

There's a good video from EEVblog (EEVblog #887 - The Economics Of Selling Hardware) where he suggests a MINIMUM of 2.5 x COGS. But I think that was assuming directly selling to customers and passing the cost of shipping to the customer.