I invite you to check this out ...
It's a small sample size but nobody in the thread has reffing income anywhere near what you claim.
Is that because they aren't smart enough? Or because this isn't as lucrative as you think it is? Your supposed potential of $100K / year just isn't reality.
I appreciate the share and i am part of the reddit group. I invite you to look closely at the locations of the people that are sharing. Additionally the 100k potential is also based on working full time. Most of the individuals posting on that reddit are ones working as seasonal, part time and or hobbyist referees.
My posts and my numbers have repeatedly stated they are in reference to the group this forum is about - SoCal Soccer. I can quote ref fees from BFE where they make a dollar and buggar all for a 90 minute game but that DOESNT change what referees are being paid and making in Southern California, especially in the the Orange County area.
I also invite you to look at the below attached picture:
I underlined in red the area that i am talking about. Hopefully that helps clarify the potential. If you are going to come back to say ref's arent paid well, please share some actual facts or even anecdotes about the SoCal Soccer scene otherwise you point is moot. A no dont quote AYSO referees as its a volunteer position.
Furthermore, here are some facts from the reddit group you shared:

He is making
85 dollars a game and 10k a year working only December and Febraury. I can post the whole conversation if you have trouble finding it.
Here is another one working 2 season and less than 8 hours a week that makes 10k to 15k a year.
I can keep posting these all day long.
Hopefully, this helps you understand the difference between full time and part time work, along with the difference in
ability to make (potential) X sum of money if you work full time vs part time.