Seems like Steve Dodge was a big proponent for live coverage with the DGPT since day one. I'm not sure if that was because it was a part of the big picture DGPT business model originally, or because the DGWT was doing post production and no live coverage, or something else.
I'd always thought the free final round coverage was there pretty much as a proof of concept. Make it free to see how many viewers you would actually get. The diehard fans were already paying monthly for DGN, so you could look at how many subscribers you had compared to the number of people watching the free live coverage.
Eventually live coverage numbers increase enough to be confident saying ok we've improved the product a lot the last couple seasons but now we've gotta invest more into hardware so all live coverage will need now be available through DGN. Post production would still be there as the free coverage.
If free spectating is going away I would expect free coverage will too at some point. As far as advertising goes, I'd assume most of that would be done as signage on the course like it is now? I hadn't thought about the limited ad time until JVD mentioned it. Signage on the course would at least be visible during a lot of the footage.