I don't see the point. Download is already darn instant.
Removing midnight, siegecastle, etc. wouldn't do anything. The newbies you are targeting would soon play those maps on pub and have to download them regardless.
Coincidentally, I was almost going to make a map pack from DP Resource's map DB today, until zip fscked up for me, and I figured that fast downloads negate all of it. (And if you wanted to download all the maps anyway, wget /archive/ off my server already works.)