I played in an epic gestalt game for a couple months. Epic spells were allowed as long as we weren't cheering around the costs. But the epic settlement we were in had a standing policy against using Disjunction, enforced through the concept of Mutually Assured Destruction. Items and permabuffs make tye difference between standing a chance and getting stomped. If you demonstrate you're willing to be that ruthless and strip things away in a small squabble, it makes every other epic person in the city worriedbthey might he next. That's how you get a dozen archmages from every corner of the alignment pool lining up to disjunction your ****.

It's not one of the weakest spells.