And there's also the shorter transit time from Earth. Really, there are a lot of good reasons to think about establishing a settlement on the Moon before Mars.

And there's also the shorter transit time from Earth. Really, there are a lot of good reasons to think about establishing a settlement on the Moon before Mars. But I still think that trying to terraform the Mooon is a bit unreasonable. And yes, L1 is unstable. But the lower bound on how little fuel you have to spend staying at the Mars-Sun L1 is much, much smaller than the Moon-Sun L1. I'd guess 10 m/s of delta-v every year for the Mars/Sun one and 10,000 m/s every year for the Moon/Sun.