There is a big difference in the Camaro production numbers of over half-a-million in 1967-1968-1970 compared to the 276 XK-19 boats built during 1970 - 1975.
Camaro production during three example years.
YEAR BASE Z28
1967 160,648 602
1968 176,813 7,199
1969 165,226 20,302
Total Camaro production is probably somewhere around 5-million cars. That puts the 276 XK boats sold in the US distributed around 50-states pretty slim, and the ones exported to other places around the world are much more rare. The prodction of these boats in Italy helps the European polulation today but that production level was relatively low.
Just keeping things in perspective, looking at Mustang and Camaaro production numbers, and then the handful of XK boats.
With the polularity of the Camaro, and the fact that the same motors were used in numerous other GM cars and trucks, it's no wonder there is an avid following of enthusiasts online at all times of the day or night. Not so with the XK-19. Info we receive on the XK boats and the early 1969 Commander SS, and 68-69 Commander, comes in at a slow pace because the production numbers were low to begin with, a certain atrition rate occurred through neglect, accident, or mecnanical events that caused the boats to be set aside (and then deteriorate), some are in "mothballs" just sitting in barns, garages, warehouses, and then there are the drivers, the restoration projects, and a few garage queens and dock queens that may or may not make it to shows. You take all of that into consideration, and then wonder how many people are online any given day even interested in knowing about a XK boat, let alone having information of any kind of interest to post, and you can see why the traffic is low for these boats.
As Mike W said, "There's just not enough of these boats to generate interest other than the nut cases like us that own them" (and classic fiberglass chris-Craft fans).
Regarding the comments I made about the previous history of the boat, I did a search for the establishment, found the owner's name somewhere perhaps from one of your earlier postings, and did another search and found a string of litigation issues about the establishment. None that I saw were bad about the owner or the establishment, but were due to theft from employees and previous employees, and suggested there may be some forclosure issues from some customers, etc., in that environment. So if the owner of the establishment (or the establishment, per se) was the seller, then one wonders if they obtained the boat because they were an enthusiast or perhaps through other reasons, either as a trade, investment, payoff, foreclosure, whatever. If it was for any reason other than being an enthusiast, then they are likely to have virtually "no interest or time" in discussing the previousl history. That's just a notion out from left field, to use an American baseball term.
The classic fiberglass Chris-Craft boating family is a relatively small group, and the interest in history and general interest from enthusiasts far outpaces the actual number of owners. The history includes an evolution from the 19-foot Lancer, with power and transmissions used in other Corsair Division models, with similar hardware such as the Morse single stalk gear selector, and of course the design history of Dick Avery and offshore racing aspects of the basic hull from Jim Wynne.
The hull construction also used the same gelcoat and resin, and fiberglass layup techniques used on the big Commanders, which means they were built better than most anything else on the market during the era. Yes there is an issue of plywood used as a stiffner on the transom, which was used on a lot of Corsair boats during the era including the 1966 Sea Skiff and 1973 23 Lancer sitting in my barn now, but for the most part the Corsair hulls across the board are solid and much more easily restorable than some of the boats the competitors were building, some of which used wood structural stringers.
As you get into the project keep us posted. It's always of great interest to see these getting the care they deserve during restoration and during on the water use too.