"I have no problem with people making money, but crazy claims and unbelievable profit margins exist in this arena "
It's not like a lot of other industries, who pile on extra charges for things that you aren't really receiving.
Yes, some items in the audio business have good profit margins, when I was in the business most speakers had "50 points" in them. But that's a "brick and mortar" shop, which has display and stocking requirements from all their manufacturers, must have a repair shop, etc. Electronics didn't have a large margin in them.