I had the same doubts. I still bought it anyway. I dont think, in its current state, its worth the money (yet). Thats my honest opinion. The basics are there, now they need to focus on tweeking things, and fixing some bugs and annoying things that are still there. If i would be a dev, i would communicate as much as possible with people who really see potential in this game. I mean, who else can tell you what is of adding value then the people who play your game? Im not really following everything of Train Fever, but as far as i can see, there is not alot of communication from the devs.
Still, its fun to play. Haha ;P