Either I've totally misread, or uninstalling the game returns one of the 5 activations.
This means that the only way you'd lose them is if your computer physically broke so you couldn't uninstall? Usually you can just hook up the HDD to another pc and do it that way, because HDDs are rarely the first thing to break, multiple times anyway... and as previously mentioned if the server for activating it dies or whatnot, then there will be a crack available because the DRM folks won't be there to release code to counter the crack. So either way you'll never lose the ability install the game. I don't see any issue here?

Only the silent can hear the whispers of the night.
Only the blind can see the darkness in your soul.
Only the wise will ever see oblivion approaching.
Only the valiant will survive in the end.