I dont think forcing members to bundle their items is fair. Not to the uploader, or the downloader. Members with slower speeds will not be able to get larger downloads, and as far as the textures, etc..I can't count the number of times I have had to download an entire set of textures or backgrounds etc only to discover I only could use 1.
Much better when members can see exactly what they are getting instead of suffering thru long download times, and having to delete alot of things they dont want.