If someone made a habbit of reporting the same posts over and over it'd be noticed and we'd know something was up.
I bet loads of people do it just to wind the moderators up
I doubt it. Its not satisfying to mess with the mods like that. We dont even know enough about the front end they use to handle the reports to know whether thats annoying at all. There is also no reaction besides maybe if you are extreme a ban. It might be a way for someone to try and raise the number of reports they write, but as hilarious points out this would be noticed.