There was a time in warlocks when -everyone- had to come each time we were raided, even if no one in their pk was raiding.

I subsequently altered that a little to make it that you had to come unless specifically told by the defenders that you weren't needed, or unless you were guaranteed to die.

It did prove reasonably helpful to have someone to grab weapons when the angel disarmed, or to loot corpses if multiple raiders were around, or simply to answer questions from those about to pile in who wanted to know exactly what they were facing, when those actively fighting the defense were too busy to answer.

Equally, I do agree with you that sometimes it can get a bit much. It is why I cannot see myself playing another paladin, unless he is a deaf paladin. When the same guy asks you to come and save him from starvation for the third time, you really want to brain him with your mace in the hope he might remember to buy food next time.