I was on the Pandora party yesterday. We were with 7 people and one GM, and I must say it was super! We went to Turtle Dungeon with levels between 75 and 84, and it wasn't unfair in any way. We still kept dying or getting really close to that, and the exp or items weren't outrageous (no single rare I believe). So I'd say get on with this! Don't stop this idea.