First they have to hire a developer with knowledge of how to do this right, as they might not even have one. Which could easily eat 10k+ of dev time as hiring good people takes a lot of time.

You could probably take any user at random from this discussion alone and they'd have the knowledge needed to make the switch from http to https. I'm certain that AMD has all the knowledge they need right now, but even more certain that it wouldn't be hard to hire someone new who does as well

Ok, but this ultimately just comes down to a debate over the amount of the cost. The principle is the same. Even if we double or triple the cost, it's a drop in the ocean for a company like AMD.