Certain brands and bag models will sell very close to original price, including chanel jumbo, and they should know this. They are losing sales over this. Luckily here in the US we have many other site options; I also use Tradesy and Poshmark but they are US-only.
You should actually look at Lollipuff--they are small, US-based but accept international buyers/sellers and only take 9% fee. They authenticate everything by computer before allowing it to go on the site. The main authenticator is a chanel expert. You can set your own price.
I had a look, I am not selling any bags, seriously, bags don't take up that much room and are investments, just selling clothes and them raving on about PP, that really puts me off, if I accept PP from abroad the currency conversion is totally a killer as PP will really take you for a ride on this, then the buyer can dispute and you might never get your item back. I take another look at them, but seriously, not overly keen to sell to the US, go through the whole customs declaration hassle and all that, then get only a fraction due to PP giving me a horrendous currency exchange rate and slapping me with charges for the transfer in another currency