That's not necessarily true.
Bioshock Infinite in particular was "disappointing" compared to projections:
http://www.p4rgaming.com/take-two-in-retrospect-ken-levines-...
2K posted losses in the hundreds of millions in the year leading up to Bioshock Infinite's release (Bioshock would have been a significant percentage of that) and continued to lose money in the year of its release:
http://www.gamesindustry.biz/articles/2013-05-13-bioshock-in...
People often ignore that these games may cost over a $100 million to develop and the same again to market (Bioshock Infinite ads were everywhere). Selling 5 million copies might only net $100 million back again (after taxes and other distribution costs).