But just like the "Flow of Cultures" thread suggests, this would only be valid in certain circumstances.
The Margraves of Brandenburg, Misnia, Lusatia, Austria, Styria, Carinthia, Carniola, etc., were encouraged to extend their borders, but at the expense of pagan Slavs & developing "wilderness" kingdoms to the east. Same with the Marcher Lords of Wales and probably Ireland.
But there were no Margraves to extend Germany's frontiers west into France. Established, recognized, powerful Christian kingdoms were basically exempt from this treatment, which is a big reason why the lords of Poland & Hungary wanted crowns and converted to Christianity: to keep out the German colonizing/missionizing efforts that were threatening their lands.
So maybe it would work for Germany expanding east, or England into the Celtic lands, or Spain into the Moorish south. But it wouldnt apply to every noble with the title "Margrave", at least by the end of the period; but originally, it was what it means: Count of the March, the warlord of a military frontier against "barbarian" neighbors.