They are wonderful, wonderful rifles, but I am partial to Winchester pumps, the 1906, 61 and 62/62A, I just don't have a bad thing to say about them.
Most 1890's, 1906's as well, were used a lot and most show their age and use. Many of them have been refinished, major parts replaced, poor bores, etc and these will be at the bottom as far as price goes. Also, the LR version is much more desirable than the other calibers. Nice, clean, original unmolested 1890's will always command a premium.
I bought my first one about twenty years ago, a 1916 production WRF, the fellow I bought it from was about 80 and his father had purchased the gun new in Cheyenne, WY. It is original, about a 70% gun that shows its age, I'm sure that little rifle took care of plenty of ranch pests and put many a meal on the table. I have three 1890's now, a S, L and the WRF.
A friend of mine is slowly selling off his collection, he has a pretty nice, 80% or so, LR, the blue is turning to brown, but it's still a very nice gun, we haven't come together on price yet, but I hope to end up with it. He also has a short variant that is probably 98% bright blue on all parts except the receiver, there is a bit of flaking on the left side of the receiver, easily the best 1890 I have ever seen. He hasn't decide to part with it yet, but I told him I wanted it. About as close to perfect as one could ever find an original 1890.
They are great, great little rifles!