Ha! I wouldn't want to spend my precious RAM on a target unless I also got some bonuses against the marked target. Maybe the marked target takes extra damage from hacks, or has a reduced RAM requirement to inflict said hacks?
I only say precious when in regards to my Katana build that doesn't have much dedication towards RAM and Intelligence. My Infiltrator, on the other hand, would be like 'You get a mark, and you get a mark!'