MB, you are correct about the MP option to concede a hole, in fact in MP one can concede a hole or the whole game at any stage. However it is an option and should not be seen as a rule.
What flaccus is saying, I think, is that often on WGT some players expect you to concede under a certain distance, but short putts can, and will be occasionally missed by most of us.
One thing is conceding because the outcome is a given and another is to feel compelled to concede in order to make friends.
I believe that when WGT implemented the concede option did it in order to give players an out in those cases where the game would otherwise mindlessly drag on. Of course some of us needed to take that one step further. I am all with the many flaccuses ;)