I think it's also important to realize that our preferred listening volume can greatly affect the need to equalize. Human hearing is far less sensitive at low volume to both bass and treble. That's just the way our ears are built. The louder you get, the closer to neutral or even your hearing becomes. So people who tend to listen to music very quietly might also tend to have a V shaped EQ curve. Perfectly normal, as it would help the music sound natural.