This was already explained a dozen of times. Bitcoin has value, but only to the person that holds corresponding private key. This is in sharp contrast to the universal value of fiat currencies, apples, bananas, oranges, and basically anything else.

Trading is a sale!? Who knows? It might be a buy as well?

Just like bitcoin is not money, apples, bananas, oranges etcetera, bitcoin bonds are not securities. Trying to put an existing tag on bitcoin and digital assets measured in bitcoins will lead you to nowhere. Every judge or regulatory agency will understand this sooner or later. Obviously, you will be among the last to get it.