I hadn't looked at BuySellAds before, but looking at it now, I wouldn't buy ads on any network that didn't let me filter by geography.
It's trivial for an ad network to implement geographic filtering, ads are worth a lots less outside the handful of major economies, generally speaking if an ad network doesn't do geotargeting it implies the ad network is trying to sell you low value international traffic at US traffic prices.
It's trivial for an ad network to implement geographic filtering, ads are worth a lots less outside the handful of major economies, generally speaking if an ad network doesn't do geotargeting it implies the ad network is trying to sell you low value international traffic at US traffic prices.