The point is self-pride in good sportsmanship.What's the point of "always gg"ing?
I could decide that my GG's are an important and earned item and only give them out under X conditions.
Even before getting into hobby gaming our little league baseball and soccer team coaches would line up at the end of the match, and good game everyone (no attitude, no crappy high fives, just gg)
I gamed tabletop, and cardgames, when I was a kid as well as Starcraft being the main PC PVP game I was exposed to. It's just what you do, win or lose, if you're a good sport. You GG.
There was a time in FPS games that if some one was AFK a lot of us would actually not kill them!