You'll end up needing more money than you can earn by the time you're like level 25 or 35 this is not really worth it and all you can do is run the campaign over and over again and then you're way too broke to continue cuz there won't be enough gold and no way to get any and eventually you'll need more gold than what you can make and you need to go to upgrade your characters to continue doing missions and stuff like that. Every mission is exactly the same, dodge that, kill this. Lol.