@Chessbee,
I totaly agree with you.
I always say gg even if i lose or win because in each game their are mistakes and we learn from our mistakes.
Their are people that say that ''gg is arogance''. That mean they have a bad sportmanship.And look on this link how many high rated player's (1800+) have said that!:http://www.chess.com/forum/view/general/know-what-really-irks-me
Saying 'gg' after a game is good thing to do as it shows that you are sport.
A player who won a game and the other person who lost ask for a match but didn't say a 'gg' can be seen as rude. Yes there is chess etiquette that we should practice to do.
However isn't a bad thing as well that the person who won ask for a 'gg' and saying 'no gg, no rematch'
So what do you think about the last sentence?