Top 10 HDTV Myths Popular Mechanics: Top 10 High-Def Myths. The $160 cables are no better than the $16 ones. I actually knew this one, and asked a Radio Shack manager to explain the difference, just for the fun of it, a few weeks ago. I concluded the conversation by telling him that the expensive cables are a rip-off and that he should Google it. Was that mean of me?