Les,
Cant say I'd agree with your comments about eating where the locals eat. When you are in a country where the locals appear to have a different rate of cleanliness, you don't want to eat there....thanks all the same.
While holidaying in Mexico, some of the locals eat from taco type stands where I would not dream of eating from....cooking outside, no sinks to clean hands, taking money...sure their stomachs may be used to that, but on the whole, non-Mexicans aren't used to that.
Sure some are clean, but others...run for your life.