Why is it surprising? Road traffic in Moscow is bloody awful, it has been known to take up to 5 hours to transit from DME to SVO. DME is good for some domestic flights with S7, Transaero, etc. I used to commute to Kazakhstan via BA, and then either Transaero to Atyrau or Uralsk, or Orenburg Airlines down to Orenburg.
SVO also has good domestic connections, maybe, though I doubt it, this is what BA is looking at. A stupid for example is the Russian migration to the Costas. I was in Zurich yesterday flying to Malaga and the plane had quite a good representation of Russians heading south, this despite a daily Aeroflot rotation and numerous charters to Malaga