whydoibother
Arcane
Sell game maps. Sell "custom maps", basically paid mods. Sell hero skins, complete with custom voice acting and custom spell effects. Sell a co-op version of the campaign as DLC. Sell small self contained campaigns as extra stories, or story expansions. Sell assets like custom announcers/narrators for the game, $1.99 custom UI or some such. Complete skins for factions maybe, like transforming your orcs to fel orcs in MP, or humans to that pirate faction.How would they monetize Warcraft 4 with a bajillion microtransactions?
There's plenty of ways to monetize, most already tried and tested by Blizzard or other companies. DOTA2 and League of Legends have done much monetization with a multiplayer RTS-ish game.