That's irrelevant to the question (hence, a case of fighting the hypothetical). Mass Driver said he would enter into an experience machine permanently (that's how I took the word 'lock') without much hesitation, if the machine-world were better but unreal. The purpose of my hypothetical was to show that while 'real' isn't quite the issue, there is something about one's own world that we're ethically attached to. And we're attached in such a way that an experientially identical world which is different only in being not our original world, is for that reason significantly different.