When I buy scopes, resale value is the last thing on my mind because when I buy things, I buy them to keep.
That said, I would NOT buy a redfield scope. The only scopes that I buy are Elite 4200, Nikon Monarch, Zeiss Conquest, and Leupold Vari-X III (or the new VXIII).
Granted, I also own a Nightforce scope (which costs over $1,000), and maybe someday I might just get a Swarovski PH (which are also over $1,000), but it's hard to justify buying these scopes when the other scopes that I mentioned are well under half the price, and are just excellent.
Zachary