Eh. Mob PKing looks like it takes no skill or brain power at all but there's an efficient and an inefficient way of gaining kills that way. I've said this a ton of times before and I still believe it. PKing is a measure of amassing a large quantity of kills, you're allowed to use bombs, arrows and your mount for a tactical advantage. It overall takes less skill to PK than spar (all good sparrers are good PKers but not all good PKers are good sparrers).
Kind of went off on a tangent there, but yea. I don't think PK boosting is actually a thing unless you're killing your same noob acc #2 over and over again which is apparently illegal now anyways.