That sounds an awful lot like "costs" which seriously compromises the "free profit" model.
Why pay money to make a better product when you can pay zero money for a worse product and no change in subscriptions? What are your customers gonna do, go get the paper somewhere else?
20 years ago, that argument would make sense. They had no competition and could do what they wanted. As an earlier comment stated: that is starting to change, and if they wait until open competitors are fully established, then it will be too late. Now is the time for them to realize that their parasitic business model is coming to an end and they need to change if they want to survive long term.
They can of course choose short term profits over long term viability, which wouldn't be all that surprising, but that changes the explanation from "more profits" to "short-sightedness/incompetence"