The per capita income in California is far greater than that of Mississippi. Real estate is overpriced everywhere, but it reflects the per capita income. If you buy a house in California, you will buy it with a California salary.
Of all the things I might want to do with my money, building a ship is less likely than anything I can think of.
Mississippi has a much less pleasant climate than many places in California. There are no mountains to go to when it is hot, the coast has few decent beaches, and there are hurricanes.