As per another comment, power is a wash either way: https://news.ycombinator.com/item?id=48119298

Cooling per unit is also basically fine, people make incorrect associations with the ISS without removing the bits of the ISS that aren't computers, including all the humans who die from heat at lower temperatures than chips can run at.

It comes down to the price to orbit vs. the price of not going to orbit. I don't trust Musk for the former, because even with the impressive demonstrations seen in Starship, they need to make that vehicle fully reusable to get the cost low enough to be an improvement over batteries and more PV and scattering the same count of units randomly around the desert in Arizona, Nevada, etc.