Indeed it is almost always when a mac has had the logic board
replaced/repaired.
It does occur.
Sometimes even a new batch of macs may ship without serial numbers or
even with a system profiler depicting the wrong system.
It's pretty rare, but does happen, so it may not be the best thing to
tie in to for a software licensing scheme.
You'd be much better off being a bit more generous or at least
trusting with your licensing.
Apple is certainly pretty fair about putting most of their software
on a good faith licensing scheme.
Heck, they're not even to stringent about academic pricing!
You might consider using something more reliable for licensing like
simply hashing the customer's name and purchase date or other info.
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