When money is the subject, I am as old school as anybody. Cash is king in my world. The thrill, the feel of a stack of banknotes will always beat looking at a set of digits on my phone screen. Like precious metals, classic cars and gemstones, paper currency is tangible; You can touch it, hold it, photograph it fanned out in your hand like some young dude on his way to the pawn shop to get his gold chain out of hock. When it comes to greenbacks– …