If it's a 5€ thing for a shop you have to get to first that might actually eat up the benefits already. (I'm in Europe, if I have to go to the city center I'd actually pay 6 € for both ways with public transport and probably 2-4 € in parking (+ gas)).

So yeah, unless I'm taking the bike it would probably not make sense to go out of my way to even cash in a 10 € voucher if it's not online or something I frequent anyway. There are no malls here in a sense that I'd be stopping by on even a monthly basis.