Actually, putting an ilvl restriction on Alliance Roulette wouldn't work upon further thought, because part of Alliance Roulette's purpose is to also act as an additional way to level for those who aren't level capped. An ilvl restriction basically means that it'd only really exist for the tomes for level capped players. And yeah, Expert Roulette's the only one with an ilvl restriction because every dungeon in Expert Roulette is level capped content by default.