Ok so people ask me now and then, why i always call for geared people to places like Malygos.
They say why would a geared person want to do Maly. Well that is true, but, a geared person in my raid is allowed to main roll on 1 type of spec gear of their choice ( which is for their alt ).
Because of this, i usually have very geared people come to my pugs most of the time. So why would i consider bringing a lesser geared person, instead of a better geared person with ulduar epics and most probably is an experienced player because of their Ulduar exposure ?
Why risk chances for wipes on a less reliable player?
It's a no brainer

If people aren't geared, their chances of invite will be lower obviously.
Another poster mentioned that sometimes the raid leader who is asking for Ulduar geared people is themself in blues and greens. I try to avoid raids like that, but i can't really call that person down for that because they are working their ass off already building up a raid, so i would think maybe that person deserves to be carried even though he will be a liability.
I am more offended when undergeared people refuse to make their own raids, but want to join a group by others and not contribute anything at all.