I don't have the cost, but there were 120 people working at Larian when D:OS 2 was finished, and now there are 250, with another 100 from outsourcing for extra help.
Cool I was wondering how many people are working on Baldur's Gate 3 I hope it does come out at the end of this year but I don't mind waiting a bit longer I want a good game not one that is rushed out I have had a lot of experience playing rushed games and there a rarely a good games