In my experience in sailing the BVIs, enforcement of mooring balls would be a joke. I’ve seen countless boat overnighting on park balls, dive balls, and private balls. The BVI government officials are too lazy or incompetent to actually enforce their laws. I also think that having a reservation will lead to charterers coming into mooring field after dark and endangering those already on a ball. Charter companies usually require that charterers be moored by 4 or 5 pm.