The scenario where someone would have several of their reports declined would mean that either the person making this reports does not have a good enough knowledge of the rules or the things that are being reported are harmless and insignificant, where a report would be unnecessary.
The report system is ment to be used to report rule breakers that haven't been dealt with for any reason like staff not being able to be present at the time or the rule breaker in question actively avoiding being caught. If you were to use the reports as means to do either of the mentioned above regarding the scenario of many reports declined, it would pretty much come off as an abuse of the system and even spam, as staff go through each report individually...