They claimed to be going full time if a certain Patreon goal is reached. Dunno whether they ever did.
Lest we forget, before they can divide it between them and then hire external help, there's the Patreon share (5-12% if I am informed correctly) and more importantly income tax happening. Add to that raised expenses for equipment (your graphics card won't last long if you render 24/7), possibly energy, ... It always seems to me that people seem to think about these sums in terms of "I have a steady income/am living with somebody who supports me and the work at Taco Bell for some extra money" which it often isn't. Also, there's arguably quite some opportunity cost - one of them lives in Switzerland IIRC. Any similarily qualified job there will probably make more than this, even discounting expenses or splitting the money between two devs. Of course they have other sources of income with their other projects.
(Note that this is not about the games update cycle or the dev's reliability or whatever, just about the assumption that 6k for two devs is an incredible amount of money if you want to make a living from it.)