I'm all for min ilvls for dungeons.

There have been plenty of times where someone gets a dungeon via roulette they don't have the gear for, such as tanks in Bardam or later SB dungeons who have leveled via HoH or for whatever reason don't have the gear for it. They might not have meant to get into a higher level dungeon and just hoped for a lower level one for exp, but now they're a liability the group has to cope with or replace.

Also, any duty past level 50+ require a JOB no classes.