Because most people I know of interpret a marking as = "please attack !"
Marking something with the meaning of "please DO NOT attack" is something entirely unknown to me.
It's like drawing circles on a target in a bow contest (Disney's "Robin Hood", for example) with the meaning of "please do not attack !"
I always say 'I cc blaster' - if some people understand it as 'you must attack blaster' (which is absolutly out of killing order) then I blame education system.
you never heard of marking CC targets? It's not like I'm using yellow 'target' to mark cc.
RenegadeRukus: ah, should say it was for PVP, then I get it, ofcourse. for threat with uber low mainstat, I guess compared to low level dps, it should be enouth in 95% cases.