My favorite is 'HID is redundant'... Sure it is, SURE it is. I don't know how people measure their personal success as growers, but I feel your input vs output ratio is a big part of it. The more you can do with less the better you are, this just makes sense. Any business will strive for efficiency as does any garden tended by a moderately intelligent human.
People fall for bling eh. And lots of weekend warriors pretending to be heads. Those guys don't know what salts or chlorophyll taste like and don't care either. So they try make up for inexperience by spending money lol lol...