I usually buy series based on what I've read and liked on the internet. So quality of paper or binding isn't a big deal to me. Ofcourse I prefer them to be better, but unless the quality is really bad I'll buy anyway. I don't really need manga too look super awesome for eternity, but I'd like to be able to still read it years from now, so yellowing of the pages isn't a big deal, but bad binding/ink fading/tearing is. That being said, I've never come across anything so bad I wouldn't buy it. The recent english stuff all seems decent enough, nothing to write home about, but good enough to last.

For me the paper quality, and the printing quality and the binding matter a LOT, because I read and re-read them many times and hope to save them a long time. Manga is going to be loved and cuddled and hugged and fought over, so it needs to be tougher than a normal book. LOVE those glossy overwrap covers on a large edition with heavy paper... (pant,pant) I want to find somewhere to order plastic protective covers, but haven't got around to looking. A lot of manga you buy is a printed in smaller quantities and although you pay ten bucks for it, in a few years it will be listed on a major book site for ten times the original value due to scarceness. Books, lets face it, are on their way out, unless the Nook and Kindle crash due to being only usuable from a single source and not manga friendly. Maybe books will be around for several decades yet. Treasure your manga and someday your grand-children will discover them in the attic and become extremely wealthy, just like the guy finding grandpa's baseball cards or uncle's first edition Superman.