This question was a little bit problematic as it asks for one type of information (how many) but implies a host of other questions that could or should have been asked on MSO. Also, it's a question about StackExchange, and people think those should be asked at MSO, even though it's a question about UX.
The observation was, and I probably didn't explain that correctly, that there are a number of notification mechanisms. Why add another for the moderator election?
Another implied question, that was answered by Vitaly, is: are all these notification systems needed?
As it stands, the original question is not good and has generated a lot of discussion. I'd like to see if somebody could edit the original question to improve it's meaning and make it a good fit for UX.