I'd love to hear how well it has sold. So many seem to think PC games can't sell anymore unless it's WoW. Well, I think it can if it's good. Divinity is proving it.
If those people exist, they shouldn't. D:OS probably doing fairly well, but there are many others that have done amazingly well, like:
DayZ
Rust
Minecraft
Gary's Mod
LOL
WOT
etc
These are all 10 million plus sellers and we are hoping D:OS is at 500k. Trying to put a perspective here, first that the PC market is viable and that as good as D:OS has done... it still has a lot of room for sales improvement.