I don't know the details of what makes a watch hold value but I do know it is not the software and CPU in the phone. I have briefly looked at pricing for some 1980's used Tags and they are still costs thousands. They also are mechanical and if they were cared for will work the same as when they were bought brand new 1980. The same cannot be said about these digital watches. Phones will move on and eventually they will not be compatible. Batteries will go and will Tag still make a battery for this model 10 years down the road? This is purely paying for the name and nothing else.