This is a nice domain hack, but it is not just a domain hack as it could be directed at the German market for a 'Coupon Company'.
Sale to an 'end user' could result in a wide range depending on the prospective buyer, but I would have a minimum price of $2k reserve but up to $20k asking price.
Nice name. Good luck with it.
(P.S. Make sure you list it on SEDO to capture the biggest German audience.)