I promise you that if someone put up an $80 Magician Lord MVS cart right now, it would sell almost immediately. I was literally mobbed with PMs minutes after posting two at $60. Magician Lord's value is definitely higher than most people here realize
As for the price guide, I say take it down. It's nonsense. Seller knows what he wants for a cart, buyers here know what they want to pay. This idea of pricing to a norm is bullshit. Go around the web and look at different seller's websites. Their prices are all over the map because they're buying these from different operators who put different values on this shit. The price guides are completely worthless. Pay what you're comfortable paying... Without some real nonsense like grading and some sort of third-party bullshit none of us want, a real price guide will never exist in this hobby.