Guild Wars 2

I hear theres also a 20% fee when the item gets sold, has anyone confirmed this?

5% for listing.
and hiden 10% for some thing… because of this I lost 4 gold. please make a notice for this in TP.

5% is an unrefundable list fee that is donated to the Orphans of Tyria Incorporated Slush Fund Company . 10% is a Tobin tax applied to the seller, the tax is used to provide universal healthcare on our action bar.

As Yaos cleverly said. There is a 5% listing fee, which everyone knows about.

Then there is a 10% tax taken from the SELLER when bought. (As opposed to a 10% tax taken from the BUYER which is what happens in real life)

So if you list 100 iron ore on the Trading post for 5c a piece, it would be listed for 500c. You pay 25c for listing it (5%) and when it sales, you pay an additional 50c (10%). So everything you sell has a 15% tax on it.

This is done, presumably, to prevent people from engaging in any kind of quick flipping of items as they would have to make at least 16% profit to actually make money.