Based on a couple of years working for an academic publishers, I'd guess commonly it's lack of domain knowledge + switching cost + switching of mental models + sunk equipment costs. Most are very small, with very established ways of working; I found it incredibly frustrating at the time that my employer wouldn't even consider even minor shifts away from what seemed an enormously wasteful print model, it seemed utterly ridiculous at the time, but with some objectivity I find it completely understandable (still daft, and I'm glad to be out of the sector, but understandable)