I personally wouldn't pay above the worth of 250 CSC for any DP item, due to the fact they can be in the cash shop hustler at any time.

Nobody's bought it because...well, because nobody's bought it. Expensive items just don't sell as quickly as cheaper items. And some items are less desirable than others. If it hasn't sold, that just means there hasn't been anybody who specifically wants that item and also has that much money to spare on it. I've got pricey items in my shops that sit around for months before selling, even if I make sure to keep them the cheapest in shop search.

Basically, people don't always buy things just because they're discounted. They buy them because they want them. And there's not much you can do to influence how much people want a certain item.

are you aiming for any sale at all or are you aiming for a quicksale soonest? If you just wanna sell it, then price it less than the Hustler would and sit back and relax. It will eventually sell and for the last year or so Subeta has been following inflationary policies so the sP will be there.

If you need a quicksale, then go to the Advertising subforum and be prepared to cut a deal. Remember to keep in mind the average user has only 13.5MsP all told. You have a wearable, so use the Shared Outfits feature of the Beta Wardrobe in your original post showing off how awesome the item can look.