Ha! Neither, NZshooter. I spent a lot of time analyzing and setting competitive pricing.
I collect prices on completed auctions, forum classifieds in a number of different forums ('fora' just doesn't sound right

), local shops, when I feel like it. I have a database I cobbled together and look for trends in the prices realized and the number of them. It started out as an insurance backup if I ever (hopefully never) had a need for it.
It got away from me.
So now I track what I own, used to own, or lust after.
Not to hijack the thread.
PbRx, any S&W 617 is sought after. The 4-inch, in particular. The 10-shooters are a hoot to shoot. Everyone that has one, keeps one. That's why so few used 617s turn up. The aluminum cylinders were unpopular for cosmetic reasons. Nothing wrong with them. A number of forum members will attest to that.
The 617-2 pictured above shared a safe with a 617-6 4-inch. I liked it better and it was the same size as an L-Frame 686P. Both 617s were uncannily accurate, a reputation 617s seem to share. BTW, the internal lock is not a deal breaker as far as I'm concerned. Besides, it's not what you'd think of as a first choice personal defense firearm.
HTH
Are you thinking of selling yours? Are you looking at a possible purchase?