I might be missing a point here, but if I don't like DnD, why do I even try to pitch for the IP?
Popularity.
DnD and especially Baldur's Gate, is an EXTREMELY popular title.
Ergo, you get the IP you immediately attract all fans of the IP - Thus get a massive surge in popularity irregardless of how good your game actually is (BG3 is decent... But no multi-GotY material honestly... But then again, GotY is often just a popularity contest not a measure of quality...)
Of course, whether this surge of popularity continues is another matter... I.e. Will all the DnD/BG fans also buy DOS3 or whatever other new IP Larian makes (Given how many people on this forum seem to hate Divinity, it doesn't seem likely)