I don't because I recognize the beauty of all anime grills equally and the fact that every new season there is gonna be new ones that will become crazy popular.
Why would you choose to become emotionally attached to a drawing? This way your mind will remain alienated and otherworldly most of the time, unless you create a thoughtform (tulpa) that you can carry with you at all times. When choosing what to become emotionally attached/obsessed with one should do so intelligently and use it to his own advantage.
If you manipulated yourself (or your brain) in that same way to gain pleasure from doing things that are productive or an actual hobby you can excel in (learning languages, music, martial arts, etc) you would be infinitely better off. Time is a finite resource, you know?
Of course you could use your "waifu" in that way. Let's say ur waifu does X and is good at it, you begin doing the same and excel because the emotional attachment provide all the motivation you'll ever need.
Most successful people are so because they have learned to manipulate their emotional states so they act in accordance to their rational desires, a good example is going to the gym consistently or putting some work every day at something that won't pay for a long time. If you manipulate yourself into enjoying the very act it cannot really be considered "discipline", because you enjoy it.