Probably the same reason some don't farm. It isn't enjoyable with the modes they have so far. Maybe if they added so variety other than maps I would. CTF, huge maps, NPC enemies, mission based themes. More variety like Halo and RFoM had. If they would award 10 marks per win and 4 per loss I would too. It takes too much time to max out on marks in PvP when you don't find any joy in playing that. It's great they added an alternative to farming. Just don't understand why make farming basically obsolete if some of us enjoyed doing it.