Okay, but logically, why do you have issues with it? After all, in your view, the world is purely physical, and nobody else is harmed.
Also, I'm not sure that you quite got what I meant by objective morality. I meant not about any objective in life, I meant a morality that is the same, no matter the standard of the person judging it. The opposite of that would be subjective morality, which says that morality varies from person to person and that we can't know anything of morality.