Hi Maritime,
I assume you are using ITASoftware to do this? If so, I have noticed the exact same problem/flaw when using the 'or any airport within X amount of miles'.
I emailed the ITASoftware developers about this, and they said that basically it comes down to the number of route combinations they can check at one time.
For instance, when you specify 'within 200 miles' from YQY, you're likely including a bunch of airports in that radius. So then ITASoftware uses some sort of algorithm to try and determine every combination of routes between all those airports (which can be quite a few). And then it must use some way of determining which of those route combinations to check during your query.
In short, I think it just ends up missing the 'best' combination. I've noticed the same thing as you. From my experience, anything over a '50 mile' radius is subject to inaccuracies.
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