And yes if you choose not to have kids your life is wasted. ANY living organism, by the very definition of life, must reproduce to leave something behind. Since eventually we all die.
Now there's an enlightened and intelligent viewpoint. So if, say, a person spent their life working in the medical field, saved countless lives, discovered a cure for cancer as well as the common cold, their life would have been wasted if they never had children? I would think not. As sentient beings simplistic biological measures are not enough as they fail to take into account the lasting contributions of the mind which can be far greater than simply reproducing.
Yap, completely wasted... someone else would have discovered those medical secrets...maybe one of their children who inhereted their superior intelligence via their genes.
You might as well sacrifice your life to save a corel reef.
There is one exception... social evolution. If you create new ways of thinking an permiate them via society, if you treat society as an organism (just like treating a bee hive as an organism), then learned bahaviours that you teach, even to non genetically related persons, act like the genes of society itself.
Ofcourse why in the hell does that PREVENT you from having children... you waste your MASSIVE potential, you should have created the works AND knocked up a bunch of women (plenty of volunteers for the guy who cured cancer) to transfer your superior genes, giving much much MUCH more to society then merely your creations (aka, adding your children's creations as well).
The only way for a person to not have children and not waste their life/potential is if they are creating great changes in society AND are STERILE to begin with... in that case it is not a choice to not have kids, and they still did something that will last on through time.
Although technically over the next billion years there is a good chance of humanity going extinct and none of this mattering anyways...
it just doesn't matter that it doesn't matter. I was slightly exaggerating for the sake of emphasis, but only SLIGHTLY...