I've found crew with similar arrangements. Often soon to be owners are looking for offshore experience. Generally if it is a recreationsl trip I ask for shared expenses including fuel, grocery moorage. BYOB. Total is usually $100 a day. So if 3 on board $33 each. Cheap avdenture. I had one crewman pay a flat fee of $1,000 for a ten day trip from Ensenada to La Paz. It was 12 years ago and we still trade email.