Interesting picture. From this perspective, it seems that the "lower" winglet is parallel to the ground or even comes with a bit of anhedral? Also, the position light seems to be at the root of the lower winglet instead of the tip.
If so, and please forgive my scepticism, this probably is a magnet for ramp rash. A careless driver will see the vertical winglet as the outer boundary of the aircraft, it being painted in a bright color typically, while the lower one is usually looked at straight at the leading/trailing edge from his perspective and hardly visible. At night, the position of the light will do its part as well. Also, the vertical winglet has been known as the traditional outer limit of a wing. So I would not be surprised if the damage rate on those parts was rather high, at least initially.