I see this as "speculating" when one does basic research and due diligence first. Buying only after he's reasonably confident the item has substance. "Gambling" is pure luck though. Going in blindly and hoping he had picked the right one.
But luck is always a factor, research or not. There are things which we simply don't know about. Especially the various variables that form a mixture, and leading to events that are either negative or positive.
You are right. I apologize. Just trading. Not gambling. Very different.