==YOU ARE GOING TO DIE==
Rather a lot.
You wear cloth, ride a unique and very distinctive mount and have a demon following you. You are a high visibility target that people will want to murder fast.
Unless you have a fantastic healer who is welded to your side, you are going to die.
Your job is to hurt as many of them as you can before that happens.
Your dots continue to damage long after you’re gone, weakening a defense or an assault and making it easier for your teammates to succeed. If you have dotted up even one person before getting gibbed, you did your job.If you dotted all of them up, feared the healer around and generally made their lives hell before finally getting dragged down and mauled by three melee and a hunter, you did your job very well.
You have no durability loss from dying in PVP, your demon comes back with you (almost all of the time), you have nothing to lose by having huevos grande in PVP apart from a maximum of 30 seconds waiting to come back to life.
Carpe Jugulum.
Dusk of Uldum, How to Battleground