I am just speculating but here's what I think will happen. If you report too many posts which didn't had anything wrong with them, then after sometime mods won't pay attention to your reports.
AFAIU they don't ignore reports like you are speculating.
Well maybe not at first but if you keep reporting posts which don't need to be reported at all and/or if they suspect that one is simply trolling then they might stop paying attention to them or simply ban them or take away their reporting rights (if there is such a thing).