Alright... seems like there are plenty of people answered, I just burst a bubble here...
Some years ago, I created this league:
https://www.lfs.net/forum/thread/90352-MTDZX--Flat-Out%21-Series%21-Season-2-%28-CANCELLED%21-%29
I was not expecting to anyone joining... but managed to get somewhat alright amount of racers joined per race. Least amount was 4, Most one was 20+ ( at peak moment ).
The funny thing was, numbers were going even higher, but dropped down due 2 reasons:
1: Some inappropriate racing in honest manners.
2: Egos.
First one was clear as sky: Plenty of cheaters using any kind of program which back then managed to sneak out anticheat system. Unfortunately for them, I was already tested absolutely everything in any car back then, so finding these was no issue. Downside was, it dropped amount of participants, because they were banned.
Second thing was a bit odd, which frustrated me in two different occasional times. As LFS Community have these top tier racers, they had ultimately found this out, and was keen to try it out. Amusingly, they thought back then this was just boring full throttle stuff with no real skill involved, but as people happen to say; "truth is more wonderful than fiction".
I admit I was highly excited. Having some top tier racers to fully challenge some hardcore "flat outters"... only to find out it was nothing like that at all.
Turns out their ego couldn't handle enough of having a truth about someone less known is actually MUCH faster than those top tierers, as it was simply so much different type of racing. Setuping the car and knowing the layouts were completely different story, as not every layout was completely full throttle one. So, after they saw their limit ( which could had EASILY lift up in no time, but because it was official league, they didn't dare to do that on the go ), they just moved away. I remember one fellow guy told via TeamSpeak that his ego won't stand about losing, as ppl were 6-7 seconds faster... that was something he never expected ever to happen.
So yeah, I or we ( as a team back then ) managed to grab few, but the ultimate top never joined. This is from my perspective back then.
Nowadays, I have nearly completely moved off from LFS, that time is no longer for me. Although I still sometimes come checking things, even sometime starting LFS and having few laps, but that's that.
( Fun Fact: Cancellation was never about lack of racers, but rather lack of time and lack of technical interest. I have seen that interest has been coming back, but it is too late now. However, if someone is willing to make this kind of league, those layouts are still in these forums to download. Made by me and other people as well. )