Well I tend to agree with you as did my Audi contact at the dealer. As stated earler mostly to keep dirt, trash and what not away from the "jewels". It does serve a aerodynamic function as well but it not really useful to the car until approx. 80 mph is what my service writer at the dealer told me. 80 mph! thats great cause thats my normal cruise speed
So the consensus is to keep it for sure!