Total speculation, but source code and private keys would be especially useful if you wanted to crack gmail and track down dissidents or generally read people's email.
> I remember paying for some really simple and crappy stuff (commercial software) back in the 80's and early 90's.
My company is still paying for really crappy software instead of using free alternatives. They just slap the label 'Enterprise' on something crappy, and sadly companies just eat it up. Granted, there aren't really a lot of free alternatives to most enterprise software... most likely because ERP middleware is not fun to do in your spare time.