Personally, I think one of the best practical demonstrations of the point ioi is making is in the Japanese sales threads. We get numbers from 3 different trackers every week (Famitsu, Dengeki and Media Create) and all of them report different numbers, sometimes significantly with ranges of as much as 10% even on bigger titles
Add to this differences in methodology and simply in what they choose / are able to track and you can arrive at very different numbers even from 3 trackers which are all considered very reputable, some of whom are used by publishers in the same way as NPD is in the USA
Ultimately, no matter how much we would love to be able to say with 100% accuracy that game X sold Y number of units in week Z, we can't and realistically never will be able to
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