It enlarges the footprint of the stand, making it less prone to sinking into soft ground (and thus helping prevent the bike tipping over).
A very useful micro-farkle
Can't find the receipt for this, but I think I saw the ad in the BMW magazine, about 40 bucks and really does make a difference in gravelly parking lots. Have to sand it and redo the paint a little; I dripped loctite into it, which chewed the paint up. 
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