Part of the cost of that lunch is the requirement to authenticate the change and/or movement of system files and applications.
Yes, it was system things, like putting her own pics into the system folder as screen saver pics.
That's actually not 100% on the mark, Jon.
A while back, tacit reported buying (I think it was) an MBP that shipped with either Lion or Mounty but was capable of running Snowy.
It had something to do with the later machine having the same architecture as an earlier one, but how anyone other than tacit would figure out such a thing is beyond me.
I remember that is something the woman at the Genius Bar said, I was getting the same processor, the same thing as the new 13" MBP, which was $300 more.