I deactivated my NI products because it looked like my iMac G5 was going to require a new logic board from what I read on the Apple support forums. It turned out to be a bad power supply and stick of memory. So I can't use GPO, JABB, Stradivari or Art Vista's VGP with my current iMac. I have other orchestral libraries and I plan on buying the Garritan Steinway so I think I'll just wait until I am ready for a new Mac and not be forced into it.
I think a user should be able to deactivate the software and reactivate it as needed. The Apple tech couldn't believe it. I'm sure there is a reason for it but it's a mystery to me.