Personally, I think the key is getting as much information out there to as many people as possible as quickly as possible. The most valuable information is good quality pictures, especially of unusual features of the boat. CWDF is ideal for reaching a great number of highly motivated people with direct knowledge of where the boat is likely to be going and how to tell one from another. The boaters will interrogate each other and the owners for more information.
Then it is up to the owners and other interested parties, including marinas, to do their bit, as Graham and Chris did so well, of keeping people up to date of their actions and actions of others in order to keep the hunt live. This is essential as a malaise creeps in after the initial enthusiasm fades. I think the thief was relying on that.
Finally, despite efforts, it proved very difficult to coordinate people into search parties. Ad hoc exploration seemed to work best. A search party may work if leads are good and fresh, but otherwise informal networks seem to work best, in my opinion. Then it is people like Junior to go the extra 20 miles that inspire others to do more.
I think it is best as a more informal and organic system but it needs feeding to stay alive.