It's not even being used as a strategy.
A lot of people run away at 0.5, and then have their guildmates kill them, just so the pker will leave their tower.
Maybe it's just me, but by arrowing their teammates, I don't get the kill, after putting in 5 hits. Makes me just get bored very fast, since it's not as fast to get quick kills as mob sword spamming, and the fun also gets taken away.