the person who's forming the party will always ask for higher AP than his current AP, this is mostly just to show off "Look I made it to 500 AP so only 500+!!"
bsh naryu and poh shouldn't even have an AP check... also 500+ for 50 dungeons is OVERKILL. I think It should be around 420-450. my AP is around 517 now and if I pug new dungeons..just forget it. You cant do those in cross server, from my experience it's been bad. They do no damage and freeze all the time. Scorpion and Lair is fine with cross but Yeti is problematic.