Hi, The ZYM is the fuel of the application, the more the activity will grow, the more the price will rise. To each friend, a ZYM will be frozen on both sides. It is easy to imagine the senario with a lot of activity.
Best regards
Indeed... Sorry, I forgot to answer this part of the question :
If your token are frozen until the deletion of a friend (the purpose it to make friends quickly. You'll not freeze your tokens eternally), you'll have more and more frozen token.
But it is the same for other users.
And more the App is used, more tokens will be frozen.
So, each token will have more value.
It is like the PoS tokens, if people freezes their token for the stack, there are less token into circulation and the token has more value !