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drewpweiner said..
Ridiculous nonsense! It is as bad as the invention of the square wheel!
No, not really.
It depends on wind strength and it's a great way to reduce chances of you choking your kite in light winds.
I have an old Naish Boxer SLE 15m kite with the 2:1 pulley bar system, and I am able to kite in just over 10knots (there is a video of me doing just that on utube somewhere).
Mowing the lawn of course. Nothing else. And hardly any upwind. But it beats not being out there!

I guess the extra pulling power which is meant to double with the 2:1 system, is that I can sine the kite faster through the window generating more apparent wind. On the 1:1 setting, I hardly have any control of the kite.