It's simply a matter of the numbers. All grade 1 guns, Lifter, Top lever, and hammerless didn't even come to 20,000, but there were nearly 120,000 Grade 0 guns.
There were just over 15,000 hammerless Grade 1 guns, which were either the PH(E) or the 10ga variety, the NH. This includes only 1340 steel barreled guns.
Compare that to almost 80,000 VH guns alone.
Grade 1 guns are far from ignored. It's only because there are far fewer that you don't hear as much about them.
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