A glued book is not the worst thing ever and works perfectly fine for smaller books or books without many double wide pages but when I drop $100 - $125 on a book, it better be sewn only. That's just my preference though. Binding doesn't matter as much to others.
EDIT: Actually, that's not completely true. I confused Hos with the Golden Age Superman. Sandman vol 1 is also well done. The rest gluewn. If you want I'd be happy to post some comparison pics.