As i said, it was a guess. We do not know their budget, and I'm going to take a wild guess that RA Salvatore probably commands a far higher salary than any other writer for Bioware does....seeing as how he has books that made the bestseller lists and all that.
Inquisition will hit its mark. Your data from NPD is flawed and inaccurate.
DAI seemed to pick their marketing very carefully on places like Twitch. I don't think it had much marketing budget but rather relied on word of mouth. EA was probably cautious after Bioware's rep from their previous few games. Now they have a prestige IP that's looking to sweep many GOTY awards and that in itself should drive numbers up through the holiday season. People do take notice to those awards especially if it's winning it on all big publications.
The average AAA budget a few years ago was only around $20 million. Let's say with the new generation it went up another $10 million. That's $30 million development budget. Not too bad. I highly doubt it spent more than 20-25 million marketing. I didn't see any ads for it anywhere. I wouldn't be surprised if their marketing budget was only a few million. I suppose all the matters is what EA expects on their return in investment. Keep in mind Bioware got a year extension and this game had to build every asset from scratch into the engine which isn't cheap.
Bioware's future products should be much easier for them to develop now that they have an engine built with those assets in place. It will likely save them time and money.