That's ridiculous, isn't selecting a target market Marketing/Econ 101? What possible reason would they have for not giving some kind of locality options?
Everyone wants US visitors so by including other countries it brings up the inventory of people looking/clicking ads which brings down the price per click which creates more ad spending
Marketing 101 would teach you to investigate your target market yourself, not simply select from a dropdown and assume that the automated real-time bidding platform will have taken that off your plate.
I have seen this play out so many times over the years, “if we fix this bug, our revenue will go down X%” and no one will fix it. Ever. Any redesigns or redacts that fix this bug will probably fail A/B testing unless they account for this bug. It holds back the entire company from making real progress with the product, all for a few extra bucks.
I wonder if there is a way to play with the url submit string, you know, entering fields which don't have a UX selection. I use to do this with FB and Craigslist, leave the search criteria, and change the locale. In facebook, it was more the search string copy paste to groups(this was before marketplace). These hacks should come in handy if someone can hunt them down. Espeially the geo-tagging and the income-bracket (I am sure there is an income-bracket criteria in their big "benevolent" database... lol