The person who takes these things, puts a camera on them and sells them for use following the action in sports television will make a fortune.
The idea is patented in the US; electric versions may not last long; it would be easy to have several and recharge them while others are flying.
I suspect the main challenge (after licensing) is in the control software. You'd either need very experienced pilots, or a good control system. A system that had the camera mounted with a gyro for stability like those old bomber turrets in a swivel ball would make things a lot easier for the pilot.
In case the above link is broken, I am referring to helicopters with dome-shaped bodies and a small blade on top that pushes air around the body; they fly as a result of the Coanda effect (the same one that most aeroplane wings use: faster air = lower pressure), as discussed on Slashdot.
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