GholaMaster
I like this game so much, I was rootin' to seeing make some loot from it.
I think adding fees at this point would only kill much of the activity. The game needs more time to find a larger user base, so keeping it free should do that.
If the user base goes up, that means more people viewing and clicking on ads, so that could make the ad revenue worthwhile, as well.
I have some hope that people might be willing to spend in the funded worlds, but I'll just have to wait and see how that works out. If it goes well, I thought I might make the next funded world have a prize/reward for the winner.