Definitely some other really good points here. When I do my pricing research, I'll normally just type in the item name, and select the sold option in the filter. You may be tempted to look at existing auctions, but
unless they are actual auctions (
not Buy It Now (BIN)), do not focus on them. I've seen way too many inflated BIN values in current sales to consider them worthwhile. However, a sold BIN sale is fine as a reference point. Just be wary of the date, and keep in mind any changes that could have occurred since that date (new model released, etc.).
I also banned all foreign sales and 0-feedback buyers. Unlike in the past, you only owe eBay money if your auction sells, and people are right about it being a bit (10% of the final value + shipping). PayPal also takes about 2%. Anyway, the point is that making your item harder to sell (by restricting) buyers only hurts you by potentially wasting your time, but at least it doesn't waste your money.
Also, you may get offers in your eBay inbox from users trying to get you to sell outside eBay. Keep in mind that making or accepting offers to complete a sale outside of eBay is against the terms of service and you have no protection at that point.
If you do Buy It Now and check that you'll accept other offers, be prepared for
ridiculous low balls. I was selling an EVGA GTX 780 HydroCopper for $450 (great condition, had everything, EVGA honors the second-hand warranty), and I had someone offer me
$100 with this to say "i can get 780ti 4x at $70 Each if you dont wanna sell ~ this card". My response was, "Then just buy those instead."
I've never had to worry about fees with a buyer that hadn't paid. All I had to do was submit the claim and relist the item.