Even though this isn't a bug (as mentioned by few others), perhaps demerit system should be implemented (not for everyone, only for admins and moderators):
I could add demerits pretty easily later on if necessary, though.
This wretch definitely does not deserve 100 merit points if he got busted down a level.
Indeed. A demerit system will do wonders (for such cases)...
Have they fixed it that your alt accounts can not give you a merit point.
Not directly but based on the following line, it will decay in the future:
Merit sales, transfers to aliases, back-and-forth trading, etc. are not much of an issue. All illegitimate merit will decay, and will account for a tiny and very expensive fraction of the total merit economy. It's basically a rounding error; fight it where convenient, but waste no sleep over it.