From all I have seen and read here, it is obviously clear that the user you mentioned abused the privileges by begging here based on the excerpts that were uploaded here for sight-seeing, which possibly resulted in her losing the karma she had already gotten. If we are to go by the uploads, then I believe members here find those posts against the forum policy, which resulted in them giving her negative karma.
Like the name sounds, KARMA! Whatever one does always has a way of getting back to them. Always, we should be of good conduct and contribute to the growth and development of this platform within our capacity.
Well, I do agree with your input, but From all the information that's being shared here, most especially based on what admin said, the karma of this user, as well as those usernames listed on the shot PX-Z posted here got zeroed out by the admin himself as a penalty for abusing the Karma system, they Karma didn't return back to zero due to other forum users giving them negative karma, if this was the case, then they wouldn't lose all their Karma over night.
Can this be multi-accounting as well? I imagine you are going to have multiple accounts to add karma to a single account. I think you can trace the accounts that the user controls.
Very possible as well, for personally, this idea had once entered my head, I thought of creating multiple accounts and using those accounts to support this one am posting with in terms of karma growth, but I did give it a second thought and later asked myself "All for what exactly?" not like I can sell the Karma for millions of dollars (as it's my goal to become a dollar millionaire), so, if I can't become a millionaire by doing this, then what the essence

- after this thought, I completely discarded the idea.
It's very possible that some of them must have engaged themselves in doing this, or even organize a group where they routinely give each other positive Karma, whether post deserve it or not.