I'm not sure how common it is, but I at least consider total well-being to be important. The more people the better. The easier to make these people happy, the better.

You must also consider that well-being need not be defined as a positive function. Even if it wasn't, if the gain of adding a person was less than drop in well-being of others, it wouldn't be beneficial unless the AI was able to without prevention, create many more such people.

An AI is much better at persuasion than you are. It would pretty much be able to convince you whatever it wants.

I'm sure it'd be better than me (unless I'm also heavily augmented by technology, but we can avoid that issue for now). On what grounds can you say that it'd be able to persuade me to anything it wants? Intelligence doesn't mean you can do anything and think this needs to be justified.

Our best neuroscientists are still mere mortals. Also, even among mere mortals, making small changes towards someones values are not difficult, and I don't think significant changes are impossible. For example, the consumer diamond industry would be virtually non-existant if De Beers didn't convince people to want diamonds.

I know they're mere mortals. We're operating under the assumption that the AI's methods of value manipulation are limited to what we can do ourselves, in which case rewiring is not something we can do with any great affect. The point of the assumption is to ask what the AI could do without more direct manipulation. To that end, only persuasion has been offered and as I've stated, I'm not seeing a compelling argument for why an AI could persuade anyone to anything.