Like 6600 said:
An older PCP is outdated, because PCP technology has advanced so much. So,
newer gets you
more performance.
An older springer is as limited as the springers that are sold today. So,
newer doesn't get you more performance (not much, anyhow).
What you do get in a springer though is hard to put a monetary value on:
You get NOSTALGIA and the feelings that come along with it:
(1) You get the knowledge that you're shooting pretty much the same type of gun that you shot when you were a kid and life was easier and happier, and you remember the good times you had with your father/ grandfather/ friends shooting them springers!
(2) You get wonderfully grained wood stocks!
(3) You get deep blueing (in rememberance of the looks of grandfather's guns)!
(4) You get traditional shapes (no bullpup eye sores, no picatinny serrations messing up the soft bulges)!
(5) You get entrance to a club of hard core shooters who
shun the easy way, and who favor the
challenge over the
kills.
(6) You get a slice of
simplicity, the simple life — a rare commodity in a world where life is complicated, complex, requiring all kinds of equipment and accessories to just make it through the day (just think of all the stuff you're carrying in your pockets and your bag you're taking to work, chargers, keys, documents, etc.).
Springers give you the simple shooting life, and a sense of
independence — just a tin of pellets and you're set for the day!
And people are willing to pay good money for (1) through (6)! Both now and in the future....

Just so you don't get the wrong picture of me:
I've been selling all my springers and I will never buy one again....
Seriously.
Matthias