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...
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.