Unfortunately, I don't quite think that'll do..let's say you join a PF to farm Shiva Ex, or DD speedruns, or anything for the zodiac. Que, get through the place once, no drop, reque, healer withraws, then leaves, get replacement, someone else withdraws, you get a replacement, whatever happens.

All in all, it's entirely possible to just be a member in a group, not even the member withdrawing or the member queing for duty, and end up penalized after Confirming everytime.