I’d def wait for the winter steam sale or something. The devs could consider a “friend bundle” type deal like many multiplayer games where you get like 4 copies for a reduced price, but I don’t see it being likely at the moment.
Could do something, like, you could buy 5 licenses for the price of 4–so it’s $15 a license instead of $20 even if it’s not sale time. Not sure how that works on the gifting system, though. I’ve only done single-license gifts.