It's the same for a lot of things. NASCAR fans that drive souped-up Vettes, people that have BMW's and Porsche's, many of whom couldn't begin to navigate on a track, much less a windy twisty through mountain roads. People like to feel they're part of a group, without necessarily being in the heat of it.
I think Poker runs are probably the closest most people will ever get to this kind of action. They can actually feel more a part of it given the hardware that's out there if they can afford it. Obviously, many are very proficient with their boats, but most lack the time, money, and even the skills to be out in water like that going fast. Just as in every sport, there's a much smaller percentage of people that can handle pushing the envelope.
But think of it this way, without PR's and fans that want to buy the fancy boats regardless of whether they are good pilots or not, racing would probably suffer big time. It's the reason Nike pays Tiger so much to use their equipment. Same with just about anything. The real tribute lies in the boaters that can take their boats out in snotty seas like that and handle it. Takes a special skillset, and like anything else, takes a rare breed. If everyone could do it, it wouldn't be much fun would it?