I was out a week ago with one.
The way I look at is is that it is little more than fashion or fad. It's like golf clubs. You sell somebody a set of clubs for $500 this year and what happens next year and the years after that? He buys $20 worth of balls - not nearly as enticing to you, the manufacturer. So what do you do? You try to convince him that the best way to cure that slice is by buying a new, $750 set of clubs, 'cause they're 'better'. In reality, what Buddy really needs to do is to get on the links and practise, but that won't make you money, so you push the 'better' clubs.
So with the shooting industry. What most people really need to do is spend more time on the range, but how much profit does that bring Ramsavweatherchester Inc? So they regularly try to convince people that the cartridge and rilfe they and their grandfathers have been taking deer with for decades is somehow inadequate. The big campaigns: "The .397 Snagglepuss MegaMag! Kills deer even deader than before at ranges far beyond your shooting ability!" And, sure 'nuff, we trek down to The Store to drop more money. "Wow! It's a MegaMag! That means I don't even have to aim, right?"
The old-timers like the .303 British, .250 Savage and .303 Savage, .30-40 Krag, .30-30, 7mm Mauser and the .348 Win put a lot of meat on a lot of tables over a lot of years. They haven't changed, Bambi hasn't changed; we're just into shiny things.