For the uninitiated - what are ye on about with "writing books" ??
...while writing our books...
...our entire Freshman year was spent reading and writing about 40 great books from that program...
and (with apologies) are these "Great Books" simply a bunch of books that they republished?
The books are republished. So if you already have them individually, they would be redundant (except for forewards, introductions, etc.). Or, in the case of Homer's stuff, you may have a particular favorite translation. The benefit of the collection is that the books are all the same size, shape, colors, etc., so it makes for a nice library display item, if that's something you like.
As for my books, my friend and I started a small business last year writing some books, practice tests, etc. for engineers seeking a license:http://www.compleximaginary.com/
We plan on writing more things as we hone our skills. Hopefully, more entertaining things in the future, and not so practical.