That's because bank infrastructure or CAD/CAM or ERP systems aren't particularly new or exciting, so there's no reason for a mania to take hold. The upside is g

That's because bank infrastructure or CAD/CAM or ERP systems aren't particularly new or exciting, so there's no reason for a mania to take hold. The upside is generally known. But something like Snapchat or WhatsApp or hell even Tesla have these crazy "blue sky" opportunities, so people can extrapolate a kajillion dollars in profits one day and no one can definitively dispute otherwise.