Regarding Battlegrounds outfit styles (specifically Pit Daemons, Fire Drakes and Storm Lord Outfit styles), I reckon each page should be buyable directly from the impresario with event tickets. The real skinny behind it though, is that you would only Ever be Able to procure them from the impresario “During the Midyear Mayhem event” implying indirectly that to get them from the impresario would be seasonal just like how crown based crafting styles like Tsaesci, Grim harlequin, Stahlrim Frostcaster, etc. come around on a seasonal basis in the crown store.
I know what you di-Iddly did... (you would be wise not to do that again during a time when Suspicion in the gaming space is at an all time high.)
by not actually revealing real drop tables in the game for all items, you only prove what has been proven with proof of concept that you can/will manipulate item drop chances based on certain elements performed by the player.