Well not exactly...
Unless you are so ultimately anal about the completeness of the service record, then its perfectly feasible to just shag the arse off it then go home ...
I'm very serious about getting my own GS911 and doing all of my own servicing - the only real reason for having BWM do the servicing is so that they can install whatever 'new' software they think you need (but I bet you didn't know that the
bike 'remembers' an awful lot about what you do and how you ride ...) but if the bike's running ok and you keep the oil fresh there's not an awful lot to go wrong.
I'm assuming that you're talking about a bike that's out of warranty too...
It'd be interesting to see just how much difference a full BWM service history would make to the bike's value - is a home maintained but mint example going to be worth more or less that an absolute nail whose service book is fully stamped?
G