I mainly play as dps (blm) and for about 5months now.. I remember from the last few times I've gone through AV that I've seen the tank die quite a few times because the whm was too busy dpsing to heal the tank. I actually had to throw pitiful physicks at the tank till the healer noticed and took over :P Seeing how much rests on the healer's shoulders for keeping everyone alive.. dps should be the last concern of a healer. Albeit, some people are more comfortable in dpsing than others. Depends on the person and their play style and how it fits into the party dynamic. Just boils down to using or not using your full potential...