If you've lost money on a sale there could be a few reasons for this. I'll go over them, what to do about if you get one, and how you can prevent them in the future.
The most common reason for losing money is because your margins are extremely low. The reason you'll probably lose money this way is because you'll pay taxes on your item from the source. Amazon charges tax in almost every state. There are 3 fixes for this.
1.a. You can get a Federal Tax ID #, then make an amazon business account, and become tax exempt.
1.b. You can go through Amazon's auto tax exemption program pretty easily without having to apply through those states. Florida is the hardest one to deal with, you have to apply on their site and provide the paperwork to Amazon. It's really not worth it in my opinion.
2. You can increase your margins much higher to make sure you cover the highest tax % you might incur.
3. You can charge sales tax on eBay from the tax table options. Click here.
I'm not a tax adviser, blah blah blah, consult a tax pro on these issues. There's my disclaimer.
Easync checks prices every 15-30 minutes
Another reason you might lose money is something like in the example below.
Easync repriced at 1:00 and the source market price was $10.00, your eBay listing sold for $15.00
The source market changed their price to $20.00 at 1:05 (5 minutes after easync did a price check)
Someone committed to purchase your product for the $15.00 eBay price at 1:10
You now have to buy a $20.00 item, and you only got paid $15.00 for it.
This is extremely rare but it does happen where someone just happens to want something in the very small window of time during Easync's price check and source market price increase.
Your options are to tell the buyer that you are very sorry but this item is out of stock at that price and you cancel the order; or you just eat the loss and ship them the item anyway. Read about how to cancel an order without getting punished by eBay.
You can prevent this situation by having extremely high margins. I don't recommend having high margins until you are in the thousands of listings and you have an anchor store. If you want to go ahead and upgrade to the anchor store click here.
Disabled Auto Ordering or order failed
If you disable Auto Ordering or an order fails, a situation similar to the one above could occur. You sell an item for $10.00 during the night while you are asleep, at work, or away from your computer; and you like to manually order your items to save the $0.20 cents on AO/Tracking. You get back to your computer later to find that the source price of the product has gone up in the few hours you were away from your computer. You now risk losing a lot of money because you were trying to save 20 cents. We actually give you the option to disable tracking upload so you could just pay 10 cents on AO and avoid this altogether.
To prevent this just enable AO and set it all up correctly.
Now you should be ready for some more advanced information. You might want to refer back to these beginner articles later if you run across any of these problems; feel free. For the advanced tips click here.