As with any pro sport or any product, the people that make the product or play the sport make money if it can be sold. A little bit of a leap skipping details...it sells if people want to advertise...and people want to advertise if a large portion of the general* population want to watch/read/telepathically observe.
When I watch pool, I see sponsors like kamui, viking, mcdermott, simonis, scorpion, predator....all pool stuff.
Watch golf and you see golf supplies ads, but I also see chevy, applebees, canon....i dunno what those have to do with golf, but people watch golf so those advertisers (which generate funds for those that produce televised/magazine/whatever golf which pay to cover golf which generates prize money for the tour) pay money to get those that watch golf to buy their products.
Why does the general population want golf but not pool? Lots of reasons I suspect. There isn't one magical reason. The example of an unexciting (general population view, not pool player view) match in the OP (nothing at all against the players. Ever see some pro golfers? BORING!) is one reason. Lack of 'common person' color commentary, lack of juiced up video production (take with a grain of salt, i was a broadcast tv director for 11 years), lack of of public heroes from the pool community (think mizerak ads in mainstream tv wayback when). Pros sponsoring items....like buick using tiger woods to promote buicks. Maybe if Ford started making ads with Jeanette Lee, it would peak public interest. Lack of real media coverage. Partner this with undertones of gambling and shady practices at pool halls. I am not saying that they are everywhere or the norm (or the opposite), but the general public perceives it that way (speculation on my part, I have not data to support that hypothosis). Real or not, perception is what matters. What else...cost of venues for events. How much does it cost to get all the equipment and set up at a casino in vegas (or where ever) for a big televised tourney? I dunno, but I know slates are heavy and tables are bulky and manpower is needed to move them. And that occurs every time. Why are there not established venues for tournaments? Like a golf courses for golf or football stadiums for football. There are reasons I'm sure. I should stop rambling as these are all just little points that are easy to nit pick over and prove/disprove. That is not what I was trying to do. Just trying to promote thought.
I do feel that the facet in the OP of why pro pool is so difficult and struggle for real and sustained money is important. Need to step away from ones own pool interest to see it.