I think the WBCCI trip is over priced. I am sure that a few adventurous Airstreamers could do the trip for a lot less money and less regimentation.
Its too bad that the Member Map feature no longer works. That used to show a couple of Airstreamers in Baja. Here is a forum thread of those that make the trip often.
http://www.airforums.com/forums/f390...tml#post228130