...perception.
If LFS wasn't promoted as a work-in-progress, people wouldn't be expecting changes and improvements every now and then. They would be satisfied (or not) with the current state of the game and occasional additions in content and engine (graphics, physics, audio etc.) improvements would just make them happier. But since LFS is sold as a work-in-progress, people just want it all and they want it now. That's why Tetris has been popular for decades, while the concept is still the same. It is not expected to provide more, than it already does.
Now this brings me to another thing. Maybe the problem is the concept of LFS, which becomes boring and stereotypical after some time. But how come that the super-simple concept of Tetris is more successful than the super-complex concept of LFS? I simply don't know
Now let's get back to the
perception. My suggestion is to change the promotion of the game from an un-finished alpha work-in-progress version, to an
experimental racing simulator with an organic development life-cycle. In other words: what you see is what you get (plus you might even get more of it and better). Without the promise of future additions, people will be satisfied with what they've already got.
Greed, for the lack of a better word, is good.