It's funny, people won't think twice about running around on a road course WITHOUT INSURANCE yet bitch and moan about spending a small amount of money to make a car be able to lap for hours on end.It's marketing, not to be taken seriously.
I'd like to do a VIR FATT, maybe next year. I am deathly worried I'll crash my car, and I know I'd need to do some stuff like cooling for the diff and transmission.
You're right to be deathly worried. Track insurance isn't cheap (but neither is tires and brakes), but well worth the expense. Most cover "events", so it's most economical to find multi-day track events to make better use of the price.