> Let’s say you work on the design and implementation of a novel scientific instrument for a satellite for over ten years. That’s a job that, relatively, isn’t

> Let’s say you work on the design and implementation of a novel scientific instrument for a satellite for over ten years. That’s a job that, relatively, isn’t paid well, but if launched, the instrument will get you papers and recognition. That's true, but building two of everything causes other problems. For a principal investigator (PI), they spend years drumming up support for a concept then hope that it continues to get funded, built, launched, and becomes operational. If we build 2 of everything, let's say it adds 2/3 to the cost. That means less money for other missions overall. That would make many scientists unhappy.