I get the impression Elon's stance is, "If somebody else wants to build a Moon Base, you're welcome to buy launches from us. Here's how you'd do it." Elon himself pretty much just cares about Mars.

I think this is a nod to ESA who has stated they want to build a base on the moon: http://www.esa.int/About_Us/Ministerial_Council_2016/Moon_Vi... Elon's message: "Here's the rocket, it costs this much, go build it". Basically trying to find more ways to monetize BFR.