From what I've found, it seems that the most recent Gamasutra salary survey was released in 2014. (Here linked.) Why has there (seemingly) not been another since then?
Were there problems with producing it? Was it made obsolete by websites like Glassdoor? Something else entirely?
… Or am I just not finding the more-recent editions? (This is entirely possible, as my search-skills have never been the best, I fear. ^^; )