Back in the 60's and 70's I'm sure there were a few people that shared your opinion when it comes to vehicles. They made fun of the guys that bought a Mustang, TransAm or StingRay and then parked them in a garage. All production vehicles but now, they are worth so much money it's not even funny. At some of the auctions, these production, run of the mill vehicles.... just like the rifles that you mentioned.... are now worth 10 times what they where when they were first sold. Some even more.
Another example is the Lee Enfield. They were sold by the pound at one time. You could get one from Sears for $8. Guys were buying them and chopping them to make hunting rifles.... now guys are whining that they can't find a nice original or the price for a good original is too high.
Everyone collects different things.... be it rifles, cars, baseball cards, comic books or movie posters. Who knows what is going to be collectible in the future. Did you ever think an old Superman lunch box would sell for hundreds of dollars after you cleaned out the basement? That off the shelf, Ruger #1 in .303 Brit could be the thing that pays for your retirement one day.