Rich,
I am not trying to make a mountain out of a mole hill, but I actually knew a guy that crossed from Dana Poit to Avalon on a PWC with a friend. They got hit by a rogue wave, one guy broke his arm, they became disoriented, did not have a radio, compass, or GPS, and could not find the coast. Fortunately, they saw a Catalina Flyer on the horizon and managed to follow it to Newport Beach.... Very, very lucky.
The race over and back is supervised and includes boats that are there to insure participant safety.
A solo crossing between SD and Avalon is a whole different story. The ships are moving 30 - 35 knots through the shipping lanes, and they cannot manuever or stop quickly. Fog is a real possibility at any time, and rough water, that could swamp an 18 foot boat, can develop quickly.
My point is the open ocean is very, very unforgiving. A light weight 18 foot boat that is designed for daytime use on relatively tame water with an inexperienced skipper and crew is a recipe for possible disaster... One mistake could kill. I would hate to see that happen to a member of this site.
John