I gave you what you asked for and so now you move the goalposts.
Of course, at this time, BTC price is very volatile, as it is in the adoption phase. The USD is much less volatile, so from the sellers point of view, the linkage is necessary in order to reduce risk. One day, years from now, it will be fully adopted and the BTC price won't need to be linked to the USD for prices.
Okay. The apartments in Dubai are items you can purchase and are actually priced in bitcoins on their site. I'll accept that you found one that shows prices in bitcoin. I'd still bet that they are actually pricing their apartments in dollars, but will accept bitcoins at the current exchange rate, but I'll admit that you did actually find a place somewhere in the world posting the price in bitcoins for something they are selling.
The other site doesn't seem to be selling anything other than trying to sell listings on their website. Or maybe act as a go-between between sellers of luxury items and buyers wanting to pay in bitcoins. Or maybe they're looking for feedback on whether that is a business model that anyone would use. I'm confused by their site, but I'm pretty sure that one would NOT count as somebody offering anything for sale priced in bitcoins.
One day, years from now, it will be fully adopted and the BTC price won't need to be linked to the USD for prices.
There will never come a day when people are barred from buying something without converting their dollars into bitcoins first.