[MENTION=6716779]Zardnaar[/MENTION]: WotC is more than happy to replace faulty books. However, you have to pay to ship it to them, and then they will "reimburse" you the cost of the shipping by including miscellaneous goods along with the replacement book. That's what I was told when I inquired about getting a replacement for my PHB.
So it really comes down to a cost thing. It's not going to be cheap to ship a hardback book across the Pacific, and the stuff you'll get in return will probably be crap.
I buy all my 5e books from the Book Depository, so I contacted them instead and they gave me some of my money back. In the meantime, a dab of glue here and there has kept my PHB together just fine. Eventually I'll replace it with a new one, but only when I can be absolutely sure that the new one is up-to-date with all the errata and such in it.