As an earlier post said, every things collectable - if someone is willing to pay.
Personally, I've got 2 'Sporters, a Mk2 & one of the later, much maligned by some, Mk4's. They cost about the same. Maybe the Mk2 had a rough life previously, but the 4 is a much more pleasant gun to shoot. Neither compare in 'feel' to my near mint ' 61 Mk3 Webley.
Bru
Webley Mk3 x2, Falcon & Junior rifles, HW35x2, AirSporter x2, Gold Star, Meteors x2, Diana 25. SMK B19, Webley Senior, Premier, Hurricane x 2, Tempest, Dan Wesson 8", Crosman 3576, Legends PO8.