Lol Blue drags 1-2M/h??? Botting Frosties is the only dragon that will make that, and sadly it's being crashed. Blue drags would be lucky to get 500K/h now considering everyone bots them.
To O/P: You can run plankers for a good 150-200K/h depending on agility lvl and script your using. You'd need some start up cash, but its fairly simple. Tanning hides, collecting fungus/potato cactus, or possibly sorc garden... Haven't been there in forever so I couldn't tell you much about the GP/h or ban rate.