One thing that you're missing, RJ (and responders), is the legal liability that these replacement refs face. One who "fixes" a sporting event for gambling purposes is likely to face jail time. By likely, I mean, with today's banking regulations it's extremely easy to track money laundering. And large deposits are an easy trigger. In other words, any individual suddenly making more than they did yesterday (metaphorically) is investigated. Anyone investigated who is also receiving checks from the National Football League will be scrutinized, internally, by the fed.
Now, I fully don't expect replacement refs to be tuned in to these facts, and therefore don't doubt the possibility of foul play.... But anyone willing to pay a replacement ref more than 10k should be aware of these things, because as a money launderer, you gotta know the fuckin rules! In other words, if I'm an outfit trying to fix a game, I'd think twice about paying some idiot ref who doesn't understand banking regulations and how to structure their pay cut.
The difference, I see, between this situation and other sports that are fixed... The amount of money it'd likely take. College kids in CBB that have fixed games have likely taken significantly less than 10k. My assumption, with this post, is that a replacement ref wouldn't accept less. And that is the general number, within the banking industry, for an investigation.