We cant use the bottom end incomes because those people arent in the home buying pool, they are in the section 8 renting pool. Of course we should use the hioghest incomes because they are part of the pool of homebuyers. When comparing household incomes to home prices, we should look at household incomes of homebuying households not all households.
BTW, Who said anything about people not living here. They do but they dont have to own homes.