There have been a few threads about sales data in the past, although the discussion isn't as intense as during One More Day.

Part of it is that current info is promising. From another thread...

Quote Originally Posted by Mister Mets View Post
#27 topped the sales chart.

https://icv2.com/articles/markets/vi...mics-june-2023

Amazing Spider-Man #26 was in 12h place, but it was also in 4th place last month. So its total sales are better than either month's data indicates.

https://icv2.com/articles/markets/vi...omics-may-2023

#28 is in 18th place but that may just be because the data is based on point-of-sale, and it's only going to include a week of sales for that issue.
There are some differences in info.

In the past, the annual publication info could be used as a gauge for the relative accuracy of the estimates.

Previous data was based on pre-orders, while the current data is based on sales.

Current info is based on ComicsHub, a system used by 125 stores in the US (there are 3,000 in the country so this is a non-representative sample.)

I thought it'd be interesting to have a general discussion to figure out how reliable all this info is.