My suggestion

[Goosy]

It'd be nice to receive experience points and crystals (aka money) from ghost duels. Even resources.

Right now, since the game doesn't even track the win/loss numbers, battling ghosts is almost pointless. Even a few experience points, or a kind of reward would be really nice to see after ghost battles.

[theconfuzed1]

I agree about experience points. I think that whatever is next in the game should require a set number of experience points to enter into.

Mining would gain you very little points, possibly measured by every 10,000 crystals gathered, blueprints and magicbooks would gain you more, with the more difficult ones being more valuable (this would be incentive for people to complete them all), and battling ghosts would gain a liitle, or a lot, depending on the strength of the ghost.