Those auctions you see are only put up by stupid people that wish they were rare, and are hoping to take advantage of dumbasses that think they are rare. The people that buy them for those inflated prices are even more stupid for paying extra for them. They will never be collectible or go up in value because they are nothing but a mass produced firearm.
Funny story, a kid was recently selling a rig locally and was going on and on about the LE rollmark being a limited edition. He told me wanted $1350 for his rifle. I looked on-line and found everything on his rifle, and it turns out I could build his rifle, after buying a 6920 and only spend $1320 for brand new parts. I told him since he had $1320 worth of new rifle, I would give him between 75 and 80% of "value" so I would settle at $1K. He went on and on about the LE rollmarks and the only one he could find was some auction, that nobody had bid on by the way, and they were asking $1400. I pointed out that anybody can ask what they want, nobody had bid on that rifle, and even if they had it was brand new still in the wrap, still in the box. His was used with about 500 rounds through it, according to his ad, and that I had already accounted for the roll marks. Otherwise, I would have offered him closer to 75% of the equation, and offered $950.