The fanbase? If they're such big fans why are they still on the demo?
The demo didn't get crappy, it got better by giving a better, broader impression of LFS. Sure, it will probably drive away a certain type of player, but those were never the type of player LFS was made for.
As said, there's a simple solution. The demo was never meant to provide anything more than a small taste.
Tough. That's not LFS' problem though.