That's a good point. There is a huge incentive to press this book, given the price difference between 9.6, 9.8, and 9.9.
However, let me point this out to you: you said you have purchased 10 raws, only 2 were 9.8s, and that resubbing definitely crossed my mind - however, from the way that you said that, it seems like you never did. So maybe resubbing is not prevalent. I think for the general collecting population, the majority would not resub. Even for slab collectors, I am not confident that resubbing is that prevalent.