This has been a really interesting thread. I never would have guessed that it would garner so much attention. Perhaps I am a bit too laissez faire...dunno.
As someone who has inexplicably benefited from the largesse of others despite being here a relatively short time, I do enjoy the karma system. Still, if it were to disappear tomorrow, I am not sure how much I would miss it.
But I will continue my personal practice of throwing out K to folks who make me laugh, who post a clever turn of phrase or who simply make me think, "Huh...".
FWIW...