I understand your position but I disagree. If I were trying to predict whether the government is going to win in court, I think reading what the government's own lawyers think about the case would be valuable. If it were possible to pay for this I think people would, that's why I think it is material. Some random person's opinion is not relevant information, but the opinion of people directly involved in a case is.

That's fine, to each their own on trying to make predictions. I did try to predict it, did it accurately (along with many others, this wasn't the hardest thing ever), and wouldn't have had any interest in any internal memo.

It's a public arena on things like this. I don't think even the justices themselves have "material inside information" until a little ways through the hearing, and people are trying to predict the outcome well before that. On the surface that might sound absurd, but it isn't.

Yes it absolutely is valuable to have access to expert opinions and people do pay money to acquire opinions from experts.

But expert advice, even if material, is not the same as insider information.