It is easy to conceive of uses, having a consistent style which conveys what you want to most any reader is another thing. If you had wrote all those examples without using the text to explain them the reader would have to stop and think about what you are doing and that is not a good thing.
Too quote myself "consistent and well defined use is most important," and I have repeated this sentiment in most if not every post I have made in this thread. My point to the previous comment was that if you were not consistent it would not make sense, if his examples did not explain themselves than they would leave the reader stopping to figure out what is going on at each punctuation mark. You can break your own conventions within a work but those conventions need to be well established before you do so and you need a good reason to do so, breaking your own conventions because relying on the punctuation is easier than relying on the language or on whim is a terrible idea.
