Because it gives people wrong vibe. Like you have some sinister motive.
I wouldn't mind being on the council too, but I leave it at that, if people think i am worthy they will vote me, if they don't think so they won't. That's it, and that's how everyone should behave when it comes to the council.
Your actions should speak for you. You shouldn't go around basically begging for votes, makes you look weak and desperate. Plus this whole council thing is popularity contest which you would win if you just didn't be desperate