1 step further. How many 7 figure sales have there been in OA vs comics? Both are in the 5-15 range as far as I know.
I do believe since OA is all one of a kind, the sale of higher end material is less often than comics, but only due to collectors not wanting to sell them, as they may never come back for sale.
If you look hard enough I’m sure a 100k+ AF 15, Batman 1 or Cap 1 can be had in a relatively short time, so replacing one isn’t that hard. How many decades does it take to get an OA cover of X-Men 1-50?