I agree with the good fellas above.... the P93 is not the easiest to find and is worth holding on to.
I try to do my homework before I buy something so I know I really want it and am not just acting on a whim. But, lets face it, we all act on a whim now and again. When selling I try to exhaust all my possible future options (needs and wants) with the firearm to convince myself that I don't need it so I won't want it back in the future, but you can't prepare yourself for ALL those future needs and wants either. Still, I feel as though I should have exhausted more options in the past if I need to buy a model back I have "given up on".
Some firearms are easy to get rid of once you have them out of your system. Firearms you aren't close to or don't bond with. Historically I have looked at AR's this way as people seem to take ownership of them and then have gotten them out of their system. When times are good people buy them, when times are bad they are up for sale. Prior to the internet you could view this in local papers, classified advertisers and such. It could be that it was a good way to come up with a quick $1200 to $1500 20 years ago, but the phenomenon did happen if you had been watching. Not putting down AR's as I own a few stock ones and love them, just looking at some of the economics of them historically.
I'd hold on to a P93 or a P91 if I had one. You just don't see them everyday. Now that is not to say that I am forecasting that they would be collectible some day. I don't know that I am ready to say that yet. But, one never knows.
Heck, I'm still trying to find that one "killer app" as we say in the tech world to add to the P series. 8)
How about carbon fiber grips? Yeah, I know, they are just fine as they are. But, I would be happy if I could come up with even a picture of those Hogue aluminum grips for the Ruger P series without having to buy them.