Resale value of "always Porsche serviced"

[MWS]

Question, what is everyone's opinion of selling a car with a complete Porsche service history vs a car that has work performed somewhere else? Granted, many independent shops may even provide superior work (sorry), but does a complete Porsche history carry any weight?

Also (as an FYI), I have always been Porsche serviced, but have been lax on keeping all bills thinking the dealer would always have electronic copies. To my great surprise, my dealer recently purged all info, now I have a total Porsche serviced car, with no documentation. I suppose I could have the service rep sign an affidavit...

I knew I was always paying more than I could have, but figured it would be worth it at resale. Sigh.