It is somewhat annoying, I admit.  However, I always rename the folders in the main library folders anyway, and I don't often go looking for the texture maps or geometry files, so it doesn't really bother me all that much.

What really bugs me are the thumbs.db files and .DS_store files that are often left in the zip.  Quite often 1 per folder, which can sometimes result in dozens of files adding bulk to the zip.  IMHO part of beta testing is taking notice of that kind of stuff, and if you beta test and neglect to bring that to the vendors attention so it can be fixed, then you really have no business beta testing.

I made a thread about it here:

http://www.renderosity.com/mod/forumpro/showthread.php?message_id=3676402

Note:  the word "you" is not directed to any one person, it is used in the general sense.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi