Unless a federal waterway is closed off by special permit or a local ordinance (such as a personal watercraft in a marine sanctuary), all legally registered vessels are entitled to use the waterway. If I go ripping down the Colorado River in my cruiser and my wake destroys a dock, yes, I am liable for the damage. That's a fact.
However, I am reasonably certain that what you're saying does not apply in this case. You would have to prove that the cruiser driver was behaving in a dangerous or reckless manner on a federal waterway. Now, if the course was restricted and cordoned off by special permit, you'd have a definite case against that cruiser driver. But simply using the same unrestricted waterway as a poker run? Good luck with that one.
Just because a poker run is in progress doesn't mean that every driver in every vessel on the water in the area that day knows about it. That, my friend, is one of the scariest things about poker runs—not the guys in the runs (though at times they too can be plenty scary) but the guys who don't even seem them coming.
X-Rated 30 isn't blaming the cruiser driver? Why should you? That's like running aground on a reef and blaming the reef.