I don't think it's likely (although not impossible) that there are many rich wrecks in that area, at least in terms of precious metals. The route of the Manila Galleons that ran east to west from Acapulco was much further to the south of Baja. The return route ran close to the tip of the peninsula, but returning ships were carrying mostly exotic goods, with the silver and gold going east via the more southern route to pay for them. The route near the Baja coast and north to California and beyond was travelled by explorers, but probably without much valuable cargo.
Good answer Goldenchest, but not entirely accurate. Please remember the California gold rush of the 1800's. Lots of ships were lost in this area as they made the run from San Francisco to the panamanian Ismus due to the lack of the canal at the time they would wagon train it from the west to the east of Panama then put it on another ship to New York. Remember the SS Central America? It's treasure also traveled this way before being lost to time.