My idea is

1.Make hero that have gear like clothing..weapon... to get gear player need attack at single player map so that this map will useful again...

2. make the gear that can combine with other material to increase the gear level...that material too can get in single player map..and you too can take the benefit with sell example successful rate scroll for combination..

3. Make shop for player who want to trade or want to buy/sell gear.

ok that all..and sorry for my english still not good..hope you understand my word and accept my idea thank you...