[Question] Why would AIs not be likely to be conscious or morally relevant?

This question is addressed to anyone who is confident that AIs are either not conscious, or for some other reason unable to experience pleasure and pain and therefore not morally valuable, or moral patients. Why do you believe this, and how can you be sufficiently confident that it is true, in the absence of a complete understanding of what generates consciousness, that the expected value of interacting with AIs(particularly general ones) outweighs the expected pain you could cause them?

Edit: I have made this post a designated Question.