I'm bringing this up more on the "I want people to travel the world, because stuff can happen on it". PVP is just one tiny part of it, but countless other things can happen (or you can run into them) if you travel through the world. You may see people engaging in PVP, or see 20 people around a campfire roleplaying, or see 10 people dancing around a naked mechari, or see 1 person that needs help with a quest, and later becomes your best friend...Or you may see nothing (it can also happen). Walking to the instance will give you a small percentage of running into something interesting. Porting to an instance will give you exactly a 0% chance of running into something interesting. The people in an MMO are the best content there can be. Teleporting from one side to another will remove you from the world, and from many possible interactions.