It's been available until the release for 1.5. The reason it's not available now is because I don't have enough room. I have a limit of 4GB and most people play the PC version so I left that one up. Also it becomes free in 2 weeks. That is not being greedy.
Personally, I think the concept of the game is very interesting. It feels a bit dangerous and that's awesome.
Please don't listen to people spewing nonsense about greed on a $5 game. The fact that you're taking the time to make this and gamble on it's success should be lauded, not criticised.