Simply put, I am not willing to exploit you mentally or withhold part of the game from you.
I am not sure if I am going to avoid downloadable-content, though. After all, I plan on developing and releasing a full game, first, then, maybe, give additional stuff that should substantially enhance the original full experience.
Then again, the games are free in not only price but also freedom. If I try something odd, you can simply audit and even modify the source code.