People just like seeing teh price they pay, I think, rather than having to OMG MATHS to work it out.
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And if I'm correct, such a listing has fewer and lower fees.
eBay have two fees (three if you include Paypal): insertion fee for making your listing, that varies by category, starting price, extras like galleries etc. and auction/Buy it Now. Not sure if shipping has an impact on it, but don't think so. The other fee is the final value fee, which is 10% of the total cost of the item.
So if you've valued your item at $10 and you add on $2.50 for postage, and list it as a BIN for $12.50, ebay will take $1.25 off you when it sells (same amount as if you'd listed it as $10 + postage). Plus the insertion fee (I think you get 20 free listings per month). Paypal then take a cut for processing the money (here it's £0.20 + 3.4% of the transaction value).
I did a wee spreadsheet to see if it was worth buying a bunch of stuff to sell on eBay, was quite shocked at how much the fees take out. There are better options if you're selling in bulk, but this gives a decent baseline to work from:
Cost |
Sell |
eBay Fee |
Paypall Fee |
Postage |
Profit |
£8.96 |
£17.00 |
£1.49 |
£0.78 |
£2.80 |
£2.96 |