The best friends I have ever had come from the Poker run circuits! I have never felt out of place even when I was running a 22' Donzi @ 70mph.
I agree with everyone that the overall cost and time involvement for the runs is what is limiting some. However, like the Jamin' and Chesapeake runs, the NJ runs are going as strong as ever.
The reality of the situation is a conglomeration of costs, time commitment, and as Gino ststed overlapping dates that has affected attendences. In the NE where we do a handful of runs compared to Fla., it is easier to fill the runs because we only have a limited amount and season.