I spent 8 months sourcing jewllery from sites such as this and in the end gave it away. I would suugest you have as much chance of making good money as Aussie has of winning the World Rugby Cup (sorry - low blow but you know what Kiwi are like).
Most items you can but (and I have had a look at the advantage site) are usually closeout or end line stock. In other words it has not sold in etail outlets. I sold on NZ's TradeMe (similar to eBay) and with their costs etc found making a dollar very difficuly. For example, bought a beuatiful genuine watch from bidz.com. retail value around $1500, I paid $150US, took six months to see and eventually got $65NZ for it. Waste of time, effort and money. Good luck