I believe it has to do with aerodynamics. A sand trap rake lies in a depressed pit. So it would be unlikely that the wind would be able to get under it to lift it, more likely to just push it around. More at risk would be structures, overhangs, little white crosses, trees that either present a face to stop the wind or an edge that allows the wind to get under it and provide lift.
But of course, anything can and will happen, when mother nature gets POed..
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