Be specific on your plans. If you want a cap on potions, propose an actual number instead of "I want a cap on potion, but I want the GM to figure it out (so I can !@#$% at the GMs for capping it too high or too low after the discussion and after the event.)"
Note: this is strictly for pvp related 'daily event'/tourney for me because I'm seriously fed up with pvp complaints, yet these "brilliant" people only speak after and never before the event though they saw the 'unfairness' coming miles away. Anymore "I knew THAT was going to happen" in (pvp related) events yet not using this opportunity to speak up now will annoy me in all seriousness, and I may not be so tolerant or jolly anymore.