It makes sense that PKs should camp resource rich areas.
In RL bandits prey on miners/poachers in non-orderly parts of the world.
Also: having your own safe personal instance for dungeons?
NO
When is this carebear stuff going to end?
Perhaps have 1 instance-dungeon at each skill level as a trainer- like the Lv10 Tanker Quest.
Make a Lv 5 one and a Lv15 one to round out the selection.
Get to have an instance of it once for each character (can still bring others along even if they have done it before)
And that's ALL.
The other ones would all be dangerous places that may respawn (perhaps in partial increments over time, sem-randomized) but anyone can get into.
I am reminded of the back section of 1E AD&D DMs guide, which had random dungeon/encounter tables including dice-charts for rolling up enemy adventuring parties that you could run into. In this case, it would be other players instead of NPCs.
Have multiple entrances to dungeons so teams could miss each other/encounter each other in unexpected directions.
Travel is fine.
I would add a motorcycle, with quest to buy a sidecar and panniers. Either could store cargo, or the sidecar can add another passenger.
Have the number of passengers affect fuel use, especially in the case of the motorcycle.
