Since Artefact doesn't always put out updates concerning videogames these days, and some of you folks are probably interested in it, this is straight from the guy behind it himself about the high combined price.
"In terms of sales, you can sell 100k copies for 3000 yen a pop and makers will get jackshit; it's case-by-case though. 100k doesn't quite cut it anymore in this day and age. Development costs continue to rise but there's no guarantee that sales figures will too."
TL;DR: Inflation, fuckers. Google it.
Something tells me that game publishers could be doing some Hollywood Accounting of their own...