Your argument is flawed, you need some serious wake to get a couch out of the water anywhere near what a ski can do on flat or little wake.
Granted these are well modded freestyle boats, but even a stock stand up can get in the air on flat water just by bouncing your legs. Do that with a sit down.
[ame="http://www.youtube.com/watch?v=1P2cdIVHR-k"]YouTube- 6 backflips Fumikazu Watanabe 2009[/ame]
[ame="http://www.youtube.com/watch?v=BliCQvf3Vy0"]YouTube- Insane Jetski Freestyle Backflips Eric Malone 2006[/ame]
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