Double the data may not be worth 30-50% more money to NASA. Going from no data of type X to 1 data of type X is worth a lot more than going from 1 to 2, and so

Double the data may not be worth 30-50% more money to NASA. Going from no data of type X to 1 data of type X is worth a lot more than going from 1 to 2, and so the leap from 1 to 2 might just not be worth it, even if it is 50% cheaper than the leap from 0 to 1.