I haven't done anything with coins yet. But I plan to and I'll tell you about what I think of the whole "worth more unactivated" thing...
Outside of geocaching I am a collector (of just about everything! LOL! comics, records, milkglass, salt shakers, shells, cats, roosters, ponies....you name it I probably have a small collection of it). Comics are my big thing though (going for a Guinness record with them and close to it now), but I'm an odd sort of collector - and I drive other comic collectors crazy - I'll bid huge amounts of money to get some rare comic book that was still sealed in it's original shrink wrap, and than I'll go home open it up and read it. Major no-no in the comic book world. I did this a few years back and several of the people whom I out bid, went hysterical and wanted to know why I did it: my answer was simple: I don't collect comics to have them sit on the shelf unread, I actually want to read the stories inside. I don't care how much the money value is. I'm not buying this as an investment, I'm not going to resell it, and in this instance the issue was so rare that the only one I could find happened to still be shrink wrapped - I wanted that issue, it had a limited edition story in it by Don Rosa, my favorite comic book author and I wanted to read it.
You see, I don't collect things because I'm investing in their value. I never buy something I would resell later. I collect things, because they are things that I enjoy. And just like how I want to read the story in the comic books, when I start collecting geocoins, I'll do it for the story of the coin's travels, not for any so-called money value the coin has.
So in that light, I say ACTIVATE THEM ALL! Send them out there, let them travel, let them build up a history, let them become legends - because that's what I'm going to be looking for. And in my case, keeping the coin would not be my goal - I would rather have a scrapbook full of photos of me with the coins I've found, so I could says: "See, I found it, and for a short while it was in my possession, see, here's the proof. I kept it for a short while and than I sent it on it's way for some one else to be able to find and enjoy."
I think, geocoin collecting is like fishing: every one wants to go after the big one that got away, but when some one captures it than takes it home and hangs it on their wall, the fun is gone - FOR EVERY ONE! No more can there be fishing trips in hopes of catching the "big one". That's how I see geocoins: I think they should be out there in circulation so every one can have a chance at trying to catch it, but than once they've caught it - don't keep it, just take your picture with it and let it go for the next person to be able to enjoy the pleasure of catching it too.
Yes. This is the other road I like to see: if you are going to keep it, activate it so others can find it and record their find. Let your coins have stories for you to tell the grandkids about. What good will it be to show the coins to your grandkids, if you don't have a great story to tell them about the coins?
I had not thought of doing this with a coin. I'm going to do it with my car, my atv, and my RV though - so that I can keep track of where I went with what vehicle, and allow people to discover them as well.