Honestly, if there was never another update I would still be happy with what I have paid for. I have spent alot more time with LFS than with, say, the most expensive game I have ever bought (Modern Warfare 2, which coincidentally I also spent the shortest time with - but that's a different story
LFS is a successful simulacrum of reality - with excellent network code - and I find it's bare-bones, 'pre-alpha' styling to be extremely attractive.
A quality local racing league doesn't hurt either! :something