Put at least 1 point into "wisdom" to get a tiny bit more of experience points, imho.
At your own ric, though. I found the game a bit harder after I had done this, because I needed that exact point (I felt so) in a different, rather combat oriented field.
But that was just my personal experience.
Yeah, Wisdom isn't worth skill points in my view, early on the skill point is far more valuable than an extra 2% XP. Besides, with careful and diligent exploration, you can find 3 items which give you a total of +4 Wisdom pretty early on.
