Well to be honest I had ONE fly, but it was once, and he didn't get far...though he got pretty high.
I had left the lid off for a while after lunch time for my beardie babies. Well while surfing the net, I caught something fluttering in the corner of my eye about eye level (standing)...so about 5 feet and some change. However it landed immediately, and I investigated my beardies viv, to find a male running around randomly. Fortunately for him he's too big for my babies to eat, so I had to take him out..otherwise I would have left him to his fate.
Other than that, I have only heard of one account of a male flying, and that was in an old study after introducing wild specimens to the bloodline of those in captivity. So in a really strong bloodline it COULD happen. But I would bet money that it won't.