It's interesting; with many sites I'd agree with you, but on Reddit, I don't look at usernames much. I recognize a few usernames in most of the subreddits I visit, just from repeated exposure, but I don't value my own accounts or the karma they accumulate. I use different accounts for different subsets of subreddits the way I wear different clothes for different occasions. If I lost an account I'd sign up for a new one like buying a new outfit. I wonder why it's different.