I haven't found a satisfactory meta-ethics yet, so I still don't know. But whatever the answer is, it has to be at least as good as "my current (unextrapolated) preferences". "Nothing" is worse than that, so it can't be the correct answer.

Better - for you, maybe. Under your hypothesis, what is good for you would be bad for others - so unless your meta-ethical system privileges you, this line of argument doesn't seem to follow.