Fighting versus bots should not be the most rewarding. If people enjoy co-op 210-2 kds fair enough but the xp/gold should be weighted in favour of the two main servers. I wouldnt shut any game mode people enjoy but if some are playing DTV for xp and gold get them to a proper (ie versus human) server.
Im anti merge of EU1/2 since I dislike the circle jerking melee (ie some guys linger at spawn, fight late leaving teammates to die outnumbered and then get duels with their buddies on the other side, while others can fight whole round and then get ganked as last alive if not part of the mutual masturbation society) and ranged spam on EU1.