In my editing work, I have to check the sources authors provide and it's so easy to flip thru the WM catalog (if that's the source . .. and even if it's not), especially if my screens are already full of the stuff I'm working on.
I also just like looking at catalogs . .. even tho I never buy anything.
Maybe when an online catalog is as easy to flip thru and hold a finger in a page . . . or put in a sticky for something I go back to once in a while . . .