You are misconstruing the motive.... I am not one that follows this belief, but I find it quite reverent and interesting. I said this also above, but I will expand a little here:
In this belief, Holy books spell out the word God, and they are treasured and not discarded without respect. The tradition is to not put God's name on writings that are temporary and informal, not to be kept, that will be thrown away. In this way, God's name appears only on what is holy, and is never made trite or common. If one is reading the word God, they will know that they are indeed reading a serious and holy book.
It is like the truists regarding the American flag, those who think it is improper to put the image of the flag on clothing or other items that will not treat that image with the respect a flag should have. These garments are allowed to touch the ground, get dirty, aren't always folded and when worn out are thrown in the trash. To some, this is disrespectful of the image of the flag. Not all patriots follow that etiquette to the letter, feeling proud to wear the flag on a bandana or a shirt... But some do follow it, and their failure to not wear a flag shirt is not a failure to be a good patriot by any stretch. Same with the writing of the word G-d.
Wow. We'll just copy that sentence right into the dictionary under "reverent", if that's okay with you.