I think No Man's Sky is also in the same boat.
I mean games which keep releasing further content over long periods without charging extra for it. Surely the amount of new sales eventually dwindles considerably. Is the cost of new content once you have the core game this low or…?
No Mans Sky still to this day sells pretty good. Sure, they don't sell a million copies every week but Hello Games is pretty small and they can comfortably keep pumping out content even if they only sell, say, 15k per month. And given how NMS is still talked about so frequently, how they launched for the Switch recently (my second copy btw) and how well received the VR was, I think that number is pretty reasonable.