Coming from the person i never have seen in pk except 1-3 times on the EA. People play what they want to play. It is simple as that.
i would say its due to the effectiveness of the farming machine known as Assassin other than that...on pvp its due to beeing easy to use i would guess its hard to see a Sin that really knows how to use the best skills a sin can offer.i can tell u i had 2 sins on PWI long time ago...one was demon for farm and another was sage 105 full rank9+12...easily noticable it was for 1shot people
Nab in PWI u can 1shot people easy if they are not r9...but a r9 sin vs another r9 is not that easy...and where u had been sunshine didn't see u for a long time