[Sephiroth]

Well, of course, they do know - exactly. Region, Area & Locality. I've said in many places what Dave9946 has said - before you buy, VM can tell you exactly what you can expect.

Now that would be honest!

What's more, they have the data necessary to tell each person who receives the dreaded letter what the usage parameters for the area should be.

They don't make apply the information they have in the interests of their customers and I find this questionable.

BTW, I've done Visio diagrams but I'm not satisfied that I've struck the right balance between detail and digestability. It needs something more than the Wikipedia diagram but lI'm struggling with where to draw the line. I might bbreak it up and put it into a PDF.