The problem with using the pdf to find errors is that after it takes you at least a month to get the errata done, it still takes at least two months for the books to go to the printer, then to the distribution centers. And that is assuming you managed to get an appointed with the printer that gives you enough leeway. That means we're talking 3+ months after pdf release before the shops have the book, likely four months even. At that point, the shops got a far reduced chance at actually making the sale.
Honestly I just hope that after these two big cons, one in july and one in august, Catalyst finds the time to take just that bit more to get things fixed before printing.