Originally Posted by IrenicusBG3
There is no real data, only speculation. Steamspy says 2-5 M for PC only. Using NB correction by year of release you get 3.3-4.5 M for PC only.
https://vginsights.com/insights/article/how-to-estimate-steam-video-game-sales

But honestly, I find it hard to believe the overall sales is far from 5M. Just indirectly considering the overall good media reception and publicity across the internet, the jump in budget from DOS2 to BG3, the acquisition of new studios and the fact they tripled their number even before BG3 EA sales, I think it is a fair estimate.
This.

Also, I'm not sure where he's getting his Bioware numbers and facts, frankly.
Even looking around, this was one of the sources with the highest numbers listed:

https://gamerant.com/highest-selling-games-developed-bioware-ranked-how-much-sold/

Party control in Baldur's Gate 3 is a complete mess that begs to be addressed. SAY NO TO THE TOILET CHAIN