I only ever seem to be playing dirge against Russians, on Russian servers, with a 5 second delay whenever I do anything.
I usually play sniper/antimage/invoker, but Dirge is becoming one of my favourites.
If you can't find anypony to give your keys to, save a few for emergencies and give the rest to the Dota key bot. I believe that you just add it as a friend, open a trade and give it all your spare keys, which are instantly received. You can also send it a steam message saying "give dota" and it'll automatically trade you keys.
I've got 9 left, and no idea what to do with them. Whilst you wait, have a comic or two.