Thank you for the replies. I understand the fact that editors do not even have to comment at all, so any response is appreciated.
That said, I am a little offended (who cares) that editors seem to take such a smug tone - that a mere sumbitter couldn't possibly know that his site meets the guidelines for inclusion. Not all of us have blinders on, only seeing what we want to see. Of course we are all self-serving, we all want more traffic/more money, but it is very obvious that if you don't belong in DMOZ, you will not get into DMOZ. If my site didn't belong in DMOZ I wouldn't be here now.
I know my site meets and exceeds all of the guidelines. It met them before, that is why it was in the directory, and now it has all of the same (still unique), valued, content that it had before, plus many additional pages of unique, useful content. If the editor who looked at my site followed the guidelines for inclusion, there is no way the site could have been deleted. That is why I was so surprised to see Hutcheson's comment that it would be "most common" that my site was deleted outright. One would think it would, instead, be most common for an editor to think, "here is a site that has been in the directory, and the owner cares enough to infom us of changes, at risk to his own listing. I will look at this site and if it is still meets our guidelines, I will do my best to get it listed properly."
Perhaps that is idealistic, but it seems more inline with what I perceive to be the intentions of the editors. As opposed to, "Oh, here is a site that doesn't belong in this category any more - I'll just delete it. Who cares if it gets relisted. There are hundreds more websites we could list...In time, I'm sure that the new category's editor will find this site again, or many other sites worth including...it's out of my hands."
While that attitude may also be inline with DMOZ philosophy, that kind of treatment would be, in effect, "punishing" a submitter for no other reasons than that the site owner added unique content, and felt that it would serve the interests of all involved to move the listing to a more appropriate category.
The message this is sending is that if you are in DMOZ, leave well enough alone. Don't worry about being in the correct category. Don't "play ball" by doing the right thing. If for some reason this site does not get relisted in a new category, you can bet I'll never try to change any of my other DMOZ listings now or in the future. And that can't be the message the editing staff wants to convey. Nor can it be the best thing for the directory and those who use it.