I know that for trainer lock, it's only trainers, but for this, I think it's everything. Trainer lock, I could understand just trainers, (it would be broken otherwise), but for this, it wouldn't make sense for only trainers.
I bet both Dark/Ghost types are going to raise in price, along with Broken Time-Space. Sableye for donks, Spiritomb to prevent them.
EDIT: Ninja'd… -_-