I really don't understand why people concern themselves at all with "karma". You can't spend it, you can't invest it, it doesn't enrich you, it doesn't help you achieve any goals (...that are worth achieving).
As explained elsewhere, it's not really the karma, it's the being asked for up-mods. Some people resent that, and for them I provide a way to punish me.
It's pretty much a high score in a video arcade.