Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: IB+ Gold, TK E+, Hyatt Globalist, Marriott LTP, IHG Diamond
Posts: 14,182
Have you ever tried to convert USD cash into Euros at a bank or a bureau de change? 13% would be a bargain.
Save them for US trips or accept the commission. It's not illegal to charge commission on foreign exchange so I doubt you will get very far...