I think "10' " over the net is a little bit of a stretch. Yes, pros do hit that high once in a blue moon, but only on defense wanting the point to end.
Think of the ballspeed of balls hit that high, even with heavy topspin. A baseliner can move forwards, take the volley in middle of NML, aim for a corner with a low skidder slice, and make it 4' inside the service line before a passing shot is attempted.
Net is 3'. 10' higher makes a ball hit THIRTEEN FEET above the ground!