I would be interested to heard from someone with some technical knowledge in the area about how much weight would have an effect, and what that effect would be.
If you are not moving then think of it as a see saw. Lets say the centre of your top hand is the pivot point so you've got what, 10cm to the knob on the handle and how much mass... a couple of oz?. How much mass and how much distance is on the other side of the pivot? There isn't really any comparison.
It is slightly more complicated when the bat is rotating around the pivot, as the distance from the mass to the pivot becomes more important as the distance is squared now.
Not technically correct but close enough. You could argue that an effective counterbalance product should actually add mass
and lengthen the handle. Or, think more about the mass you have towards the toe of the bat rather than things on the top of your handle.
I like too that people think a lot about counterbalances and grips but don't give much thought to the weight of their gloves. There a lot to worry about if you start looking in to the realities of placebos or subtleties of feel

We are all different though so the easier answer is play with some lead tape for a few pounds off ebay and see what you think (60g as a starting point). While there are counter balance pro's there are also lots of guys doing this so it isn't easy to blindly do the "pro" things for instant runs
