It drowns out all uncontrollable and annoying noises with one you can control and enjoy.
MotionMan
What uncontrollable and annoying noise are in your bedroom that one needs to study with the television on?
At the school library? I agree, there were lots of noisy people at my school library, but there were always quiet spots. I studied in the library most bottom basement(S-2) where no one wants. There was barely any lighting in that basement besides desk lamps. Or I get myself a group study room with 2 different ID's with only myself in it.
If library noise is too loud/uncontrollable/annoying, I study in my room not get a CD player and start listening to music while studying.
If studying in my room is too loud/uncontrollable/annoying, I go to the library not get a CD player and start listening to music or turning on the television while studying.
If both library and room are loud/uncontrollable/annoying, I find another quiet spot. No need for me to drown out loud/uncontrollable/annoying noise with another kind of noise. Noise is noise, regardless of how controllable or enjoyable it may be. I would rather study without it.
We are not talking about studying/reading a book at Starbucks or a shopping mall food court.
If the noise is really uncontrollable and distracting, find another studying spot?
But hey...If people claim it helps them "focus" and it works for them, who am I to judge?
I'm just stating my opinion that's all.