Well you can for racing teams, but I'm not sure how soccer or Australian football don't qualify as team sports.
I mean if 5,000 people at a PSG exhibition game counts, why do 5,000 people at the Riverhounds at Louisville game not count?
There were also fans last weekend at the following USL games:
Real Monarchs vs San Diego in Utah
Indianapolis vs St. Louis in Indianapolis (at Lucas Oil Stadium in fact)
Tampa vs Atlanta 2 in Tampa (7,800 at that one)
Colorado Springs vs New Mexico in Colorado
Oklahoma City vs Tulsa in Oklahoma
That's six games last weekend in the United States with limited fans at them all before the PSG exhibition game also played with limited fans. Why does one count and not the other six?