Everybody kept their camera(s) in leather cases in the 1960s and 1970s. It's how things were back then.
Nobody keeps their camera(s) in leather cases nowadays. Again, it's how things are.
Another factor was, in 1966 when I bought a new Rolleiflex 3.5E2 TLR, it came with a leather case included. Also a leather strap and a lens hood.
Nowadays you want a case for your camera, you buy it. Market forces.
We know better now than to keep our cameras long-term in leather cases.
I bought two used but "as new" Rolleiflex Ts in the 1990s, from a dealer in Melbourne. Their cases were offered to me at extra cost. I passed.
But it did annoy me that this dealer (who had taken the two Rollei Ts on consignment) probably got them with cases, but split the lot to sell the bits separately.
It rather amused me that he wasn't fussed about my not buying the cases (he asked for A$75 each, no way!), but was visibly annoyed when I also passed on the lens hood (I had several at home, bought for peanuts from charity shops over the years).
Will we now go for a "why don't we get a lens hood included when we buy a camera" thread? Which all helps pass the time...