That simply makes them both common doesn't it? Saying there are more Mach 3s doesn't make Fatboys rare. As others note,they are simply in high demand. They only made 8,000 Studebaker Hawks like mine yet you'd pay a lot more for a 57 Chevy Belair that they made a zillion of (500k+). Nothing to do with scarcity, everything to do with collectors' demand.