They do if you set the number of ends. If you don't set the number of ends then you should expect people to leave when they want.

And don't say they're cheating. One, you got into a game the didn't have a set number of ends and two, they might have real world issues they need to deal with.

A simple solution for this is to have non-skins games start with a 1-0 score for the player without hammer.

But then again, scoring and ratings for curling have 

always

 been broken.  Don't hold your breath.

No, Rake is right (did I actually say that)..set the # of ends, if they bail before then you win the ends. Otherwise, don't sweat the stupid ratings points and just have fun!