I'll give you "creative", but not necessarily "intelligent".
Ok, I agree with that.
So how does this all tie together?
I don't thinks people are going put more work into an RPG then they enjoy. So how much of an impact will having a 2 to 5 pages worth of 'make an house rule in the DMG and/or MM make? I don't think much. Now what I think really would help is a book on how to use house rules to make their world unique would have a greater impact if it was marketed that way to both players and DM'S. It does not even have to say how to make the house rules but show examples of simple things like renaming character classes will have an impact, to creating and using unbalanced classes can be used in a stable long running group.