Just checked the state of the game on PC and found this interesting.
Right now there is over 21000 concurrent players on Steam with estimated owners to be 35703 (±6851). That is a pretty solid number and just the sales of the game should be over 1 million USD easily even if we go pessimistic with the estimates.
So while we might be "niche" in comparison to consoles, it's good to put things into perspective and remember that we are million dollar market too.