Yes, same with mine and every black gloss painted alloy I've ever seen. If the weather's OK this weekend, I'm going to give them a going over with AF Tripple with a foam pad, which last time I did it, reduced the surface scratches by 90%.
Not a lot you can do to avoid it really. It's like the paintwork of a DBP (deep black pearl) Golf. Looks great when new, but no matter how carefully you wash it, over time it will have surface scratches, cobwebbing and hazing. Nothing a good polish won't put right though.