I think they are meant to hold your phone in your purse, not protect it from drops. I do have a LV purse (or 2) but I cannot see myself spending $250 on an iPhone case. But if I got it as a gift, I would use it!
If authenticity is important to you, be careful when buying any Louis Vuitton on eBay. The majority of LV items will be knock-offs. Anything under $100 is almost guaranteed to be fake. These cases sell for $250 if purchased directly from LV. You can order directly from louisvuitton.com, or from eluxury. If looking for a used case on eBay, sort by price and bypass the lower-priced cases, and request a guarantee of authenticity from a seller with excellent feedback.