Subject: Re: BRK experts in denial
IV calculations of $400-$430 are probably not correct and in fact may not even be close to the actual number.

You may be right. Who knows?
But bear in mind that there is a big difference between what actual fair value is, and what the market is likely to pay on a typical day, which is generally a fair bit lower : )

For myself, I frequently post observations about what the market is likely to pay, but avoid any mention of what I think the actual IV is. I don't even try to calculate it for myself.

Jim