there is intrinsic in the context of where we are as humans, that's why saying that there is intrinsic worth is correct. Humans need to eat, intrinsically. I guess partially it depends on whether the word 'intrinsic' still applies.
it's the only useful definition because what else would ever be useful just for its own sake? There has to be a reference point and the moment you have one, it's technically not intrinsic anymore. So we can't do that.