Yeah, I think you have to weight the cost-benefit analysis. I've EP'd for 8 months, getting about five ounces a day. I'm quitting now, even though DD hasn't reached a year, because I realized that, for me, spending quality time with her is more important, and will make me a better mother, than giving her those five ounces of breastmilk a day.
Everyone's cost-benefit analysis is different though. Is an ounce of breastmilk valuable? Absolutely. Is spending time with your kids rather than on a pump valuable as well. Yup!