Which does it mean if I say I was the winner in every one of those short games?
Personally, I think it means I just got real darn lucky.
I buy into the intimidation theory. You offer surrenders so often that someone is bound to take one :-P
On a serious note, in games I would consider with average dice on both sides, it does take about 10+ turns in order to see who comes out ahead. 10 is about the turn that capitals fall or on the verge of falling if relatively conservative play is applied. You can end it sooner if you are aggressive and trade faster, but 10 is when the chips start to fall.