I remember a gunsmith friend of mine who was welding crates of K-98k in the years 1980's.
There was no interest at the time.
Then your gunsmith friend was working and dealing in very small circles.
I first started my love affair with different models of 98 type rifles in the early sixties and there was already a very large circle of collectors for these types.
They were cheap, even considering the prices at time, in comparison to their commercial counterparts.
Then, just like now, some folks could care less about them, some considered them to be "basic" rifles and only suitable if you couldn't afford a commercial type.
Others wouldn't look at them because they were designed to "kill people" which was a very popular Liberal catch phrase back in the day to calm the nerves of "hunters" who voted Liberal.
I paid appx 50 cents a pound for brand new, or FTRs on pallets or in crates, if I bought in quantity. So, I bought in quantity, much to my father's discontent, seeing as he was anti anything to do with firearms.
I've sold off all of the firearms from those days, a few recently. Great investments.
It's time for someone else to take care of them for posterity.
I've spoken with folks who started collecting 98 Mausers before WWII. They could be purchased in almost any configuration back then.
Collectors back in the day wouldn't even take a second glance at many of the 98s being offered today, mostly because of concerns about authenticity.
We didn't have "websites" such as Gunnutz back then. We had a few collector clubs, some with monthly or yearly publications or mail outs, but mostly it was a few interested persons in the area we lived. It's much the same today, other than we are connected by the internet.
Good quality 98 variants have always demanded a higher price, some with special histories will and always have fetched high prices no matter what condition.
When I first started collecting/shooting 98 variants there were only about 3.5 billion people on earth, now there is close to 3x that number and there are a lot less rifles to go around to those who want one.
Demand has always been brisk, now it's almost rampant.