Soldato
Nearly all my shots are portraits, and i've never had the need for a battery grip, i think my camera is more than comfortable enough, personally, i'd get a flash gun or a new lens before a grip, just buy a spare battery pack instead of a grip at first
I felt the same, then I bought it and realised how much more comfortable it was taking photos in portrait as if you were holding the camera in landscape is. I got it 2nd hand for £60.
Of course, it's not for every, just most people.