Good thing LessWrong cares only about the past and nobody is interested in anything that might happen in the future :p
And anyway this is not the only reason, you can easily argue (I am doing it right now) that it is better for a site to have less fake accounts. It might be just slightly better but it is not very hard to implement a fix anyway so we might as well implement it and make this place slightly better.
A word from a cranky tech professional: unless you are personally capable of making a change to a system, make no assumptions as to how easy or hard it is to implement.
It came to my attention that when you receive downvotes for your comments, your karma goes negative and you need to "pay back" to be able to post to Discussion or to Main.
Since new users start with zero karma, having negative karma seems to just encourage those with negative karma to create a new account. We don't want to encourage people to create superfluous accounts, do we? Therefore I think LessWrong codebase should be patched so that karma does not go below zero even with lots of downvotes.
What do you think?