Right. Households often have multiple incomes. That doesn't help the OP's point, though, since people in Ohio are more likely to live in a multi-income household than people in California.

If you look at per capita income instead of household, Ohio gives $135,500/$26,937 ~= 5, and California gives $405,000/$30,441 = 13 By that standard, California is 2.6 times more expensive instead of only 2.