Sure there is. A person of enough collective benefit becomes valuable enough to the surrounding world that they can be ignorant of their own selfish needs. They will simply be satisfied. You needn't be sacrificial about it. That wouldn't be altruistic. It's just a strategy that can become sort of a fetish. I wouldn't call it a fantasy. It's just got some blind spots that promote a pleasant state of mind. If you're not aware of your own envy for such a state you might not notice yourself contriving reasons for it's absurdity or invalidity. It's really more of an ignorance. While the unexamined life may not be worth living, life cannot be comprehensively examined. You will always be ignorant. To be so affronted by your own ignorance that you only conceptualize it to immediately and compulsively destroy it is a gross limitation. You have the opportunity to accept more ignorance in yourself such that you can then optimize it.