Yeah, I've noticed this too. I figure my R11S is worth about $20k if you really take the time to part it out down the smallest components as many do on Ebay and at the Beemer Boneyard.
However, you do get lucky every once in a while. I was able to 'score' a new set of the Boxer Cup Replika lower cowl decals for 1/2 price on Ebay and a new OEM front panel for about 30% off typical retail.
No, no... nothing bad. Just holding the decals in reserve and swapping out the original front panel which has a pair of
Wunderlich carbon air cooler duct grills installed. The new stock one will get the more discrete and reasonably-priced Hornig screen that sits behind the front panel.
Just never warmed-up to the Ilmberger duct covers and the right-hand side one doesn't like to get wet. Probably fine for a garage queen or Sunday driver, but not a daily driver that gets wet all the time. Yeah, I was surprised at how much those suckers sell for too...