John Derringer started out in his dad’s shed with $600. He had bought some wheels for his old Subaru, picking up an extra pair and selling them for a profit online. That got him hooked. Eventually Dad got tired of him taking up the garage space, so he moved to a Public Storage facility, then his first warehouse and performance auto shop. John channeled his listless personality—one that got him in trouble in the past, including a brief jail visit after trying to evade police on a motorcycle—into creating a successful business. It took some tough decisions—closing down the auto shop to concentrate on online sales meant leaving behind weekends at the racetrack—but it’s been a boon for the business. Amazon sales continue to accelerate faster than those on other marketplaces, and John attributes that to product reviews.