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There probably should be two report buttons or two queues or something. One for urgent things and the other one for sig spam or whatever. Maybe there could be dedicated mods/patrollers that handle the sig spam etc. There's thousands of spammers and bots making thousands of posts so it's never-ending.
Or, if the system lists the reported post sorted by the date of creation... So useless old reported post will stay on the end of the list, and they won't become a good report soon. This will make the report spammers search for fresh spam post...
(Or, to create spam post with alt account, and report them immediately, so they will stay on the top... but I doubt that they will create spam posts just for the report badge

)