The 28's are getting buyer "respect" because the "average Joe" who has a handgun or two and is looking for a S&W .357 is finally realizing what S&W fans and revolver enthusiasts have known for the past decade or so........that $4-500 will buy you a nice condition, tight Model 28 that is much more gun than $7-800 will buy you NIB these days.
That's why I'm moving quick to add some M 28's to my S&W collection, to go along with my dozen or so K-frames......the average gun buying public is starting to wake out of their foreign made plastic, alloy, MIM and poly infused coma of gun buying frenzy, and realize that the best guns ever made, were made out of steel and were made right here in the US of A.......in a few years older S&W's, particularly the N and L frames, will start climbing steadily in price and collector's will be more reluctant to let them go. I just went on a buying spree of Ruger Six revolvers recently, for the same reason. Buyers are starting to seek them out because a tank-tough medium frame .357 is a desirable commodity these days, and the guns that are $300 all day right now will be $600 in 2 years. If there is no equivalent alternative made today, people WILL start gobbling up the older stuff.