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Buying these books hasn't been worthwhile in a long, long time. Their information is never complete and often contains a few errors. These days you have to buy two books to get the complete package, and there's a delay between their releases. The internet collectively has a much more comprehensive guide in a matter of days. As soon as the next paired version of games come out, the books become obsolete. Good luck reselling them, because even if you find a buyer, their weight ups the shipping rates that takes a chunk out of your profit. You're left with a heavy tome of useless information taking up space.
Seriously, why bother?