Sure if you have the Phantoms and the myriad of undeads chasing you you'd rather just run instead of looting every single undead. But if you can handle yourself against the phantoms why not go with the latter? I'd imagine all those undeads giving up a lot of crowns after you've finished defeating them. The phantom isnt' that difficult to kill, either.
So why not kill every single undead in a graveyard? Why does everyone prefer to run through it instead? It's a waste of 10 energy IMO.
There's a phantom for each player present.
With a full party, that's four phantoms.
Plus, enemy health up-scales with the number of players present.
That's four harder-to-knock-out phantoms.
As a result, it's often uncertain that you'll actually survive to the elevator if you try to clear everything out in a full party.