Butch, they're commercial rock/soul/funk charts. F# and G are pretty darn common in that genre, which we take off the records. Still, wouldn't you agree, if you've got an F, you've got a G? Maybe that's just me, but once I got past E it was all the same up to the Ab "wall". I can "hit" above A, but not play above A.
I don't play the lead book at DCJB, but that book has a good number of Gs. That's modern, contemporary Christian big band music. Well, let me put it another way. There's about 150 charts in the book and maybe five to ten have the Gs. So the ratio is low, as you suggest, BUT they're there.
I can imagine that older, less contemporary books would have much fewer Gs. I played lead in a big band in Midland, TX and there wasn't a single G; however, that's probably because the music was selected with my limitations (at the time) in mind.
Dave