How do these Amazon-dropshipping eBay sellers make money?

http://www.ebay.com/itm/301661108263?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT Helicarrier $340.45 - $34.05 (eBay fee) - $9.87 (PayPal fee) - $0 shipping cost (Amazon Prime Account) = $296.53 revenue Amazon Price: $349.95 cost Profit (loss): ($53.42) These types of sellers have great reviews, and I've purchased a few sets from similar sellers with no complaints, but have always wondered how they make any money as they seem to just drop-ship from Amazon US.  Do the seller
Thanks for the link (and that great Niko video). Interesting that he's been doing it for a while and no one has copied whatever he's doing. Even with a slightly favorable exchange rate or CC rewards, seems like the margins would be awfully low with the eBay/Pay-Pal fees.