To my eyes, peaple who buy bundles are, within the users that do not modify the content, either unable to afford a modeler that could do all those same models, rig them, animate them and texture them, ...or just don't care using them in their project.
Also, there might be the case (rare) in wich they buy a cheap bundle pack to use it as template objects better than cubes and spheres. Something to "show off", while the modeller/s work on the real stuff.
Yet thats what i think about it. Comments regarding this interest me, as i might jump to the bundle thing in some time.