There are lots of reasons someone might want to import or export Wavefront OBJ files. You hit upon one, to consolidate a number of seperate items into one obj file. Saving a morph in obj format is another. You might want a head with eyes, but not all the other body parts, in that case you could export the head and each eye as seperate objects, then import them parent the eyes to the head, and save the whole thing to a props pallet. Some props are distributed as as obj or 3DS or other formats, the only way to get them into poser is to import them. You might want to export a prop to reset its default location. These are just a few of the reasons you might to use import and export, there are others.