From what I've seen the primary benefit of Glock grip reductions is for more comfort/purchase with the gripping fingers, rather than moving the web of the hand closer to the trigger. Another advantage for some is that the weapon is more 'pointable' with the heel of the backstrap removed.
If you strip your frame and remove the trigger housing you will see that there is very little material that can be removed above the trigger housing pin. As close as I could figure with my calipers the material is about 0.133 thick across that location. You couldn't remove all that thickness, I'd guess max would be around 3/4 of the thickness, about a 1/10th of an inch (.09975). That is not going to get you very much additional finger on the trigger.
Smoothing the front of the grip and getting the backstrap reduced would probably allow you to more comfortably break your grip by placing the moving from the 'vee' of the hand to the proximal joint of the thumb. This compromise would allow more finger onto the trigger.
I really think that is what Robar is talking about when they make this statement in their FAQ's:
Will the Glock grip modification reduce my trigger reach?
Our modification will provide significantly better control of your weapon. It will also provide better access to the trigger.
This is their description of the grip reduction:
Robar’s® Backstrap Reduction is the most popular grip reduction offered and usually is sufficient enough of a reduction for 85% of people. We remove the hollow palm swell on the backstrap, fill the area, smooth it over and texture the back and sides in our ‘medium’ grit texture. The result is a straight grip angle and a smaller, more manageable grip size. If you shoot high with a conventional Glock™ grip you will right on target after the reduction.
Here is another company that does these: http://www.burnscustom.com/glock.html
In terms of selling the pistol - Glock 19's are pretty popular, I cant imagine you'd have trouble pedling your mags and holsters.
My opinion is that I would go to a pistol that fit my hand better. Shooting with a less than optimal grip limits you.
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Every Communist must grasp the truth. Political power grows out of the barrel of a gun. Our principle is that the Party commands the gun, and the gun must never be allowed to command the Party Mao Zedong, 6 November, 1938 - speech to the Communist Patry of China's sixth Central Committee
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