Hey Blowtorch,
I don't want to insult any BLR fans on this board, but my IMPRESSION is this:
BLRs are beautiful to look at and hold, and they come in hi-power cartridges, and they cost alot. The triggers are not very good, and they are hell to take apart. I think that the guys who buy these are upper-end folks, who really like a beautiful rifle on the wall, and maybe only take it out to hunt once or twice a year, primarily for deer or elk, and they simply do not shoot it very much. They love OWNING the rifle. Because these rifles are not USED very much, most of the ones I have seen are in very good condition (98% or better).
Marlins are a different story. They are more utilitarian looking, are built like a rock, have a good trigger, are easy to disassemble, and are a joy to shoot. They are also very reasonably priced. Guys who own them shoot them alot, and hunt with them alot. At my gun club, it is not unusual to see a guy at the bench in the middle of the summer, shooting 3 or 4 boxes of ammo thru his Marlin, while sitting, standing, and kneeling, just for the sheer joy of shooting it. No adjustments to the scope, no tinkering with the sights, . . . just shooting. It is also very common for guys who own a Marlin to keep it for 30 years or more, and kill 30 deer or more with it. I am sure that there are a few people who have done this with a BLR, but compared to Marlin, this would be rare. And, because Marlins are used alot, the ones for sale in used condition range all over the map, from 80% condition to 98% condition.
So, maybe the reason for the very high price of used BLRs is that most of them are in 98% condition or better, and there are alot of upper-end folks out there who like buying and owning and collecting them (just like high quality side-by-side shotguns), and this keeps the price up.
Just my thoughts. Glad to hear others.
Mannyrock