Can you increase the time length for the elixirs? It costs platinum to purchase them or a lot of money. They should last much longer especially when you're on elite quests and shouldn't wear off until you physically leave the campaign. If not that, they should cost no more than a 25 pack of potions.
The coolest thing to do would make it a skill option for all character types at a certain level ...Say level 30 - 56 in which you purchase the skill and can use the elixir to enhance your character when you need it most.
Many of us have had to quite certain campaigns because we can't complete them because it's too hard. If you have to draw out the monsters one by one to defeat them as a group (I'm talking about even with L50 players) then 5 mins is not enough time for the elixir. And that 5 mins sure goes by fast.
<---this is me ...continuing to buy platinum and still addicted! LOL
Thanks for your time guys!