The prices are strangely inconsistent. $280 is a lot for a plain silk tie by any standard -- Tom Ford and Brioni et al actually do interesting things at that price point (unconventional fabrics, knits with standard point bottom, etc). $315 for plain cotton tees and $510 for a plain sleeveless jersey sweatshirt is pretty silly.
I figure the ipad case is just stunt pricing because of the studs and to attract attention.
On the other hand, dress shoes with lots of studs are under $1000, whereas I've seen similar things by Prada and Gucci well into the four digits. Jeans in the $400s is pretty standard right now, including for less prestigious brands than this, and $1300-1800 actually seems low for outerwear in the rarefied YSL echelon, though it should be noted it's minimally structured and made of 65% polyester / 35% cotton.