This is very frustrating as a consumer to have no idea what reality is on something like this. I would like to see valve, as well as all sales channels in general, regulated to force this data to be released on a quarterly basis at least. From the stand point of protecting the public it makes sense that you get a record of what a company is grossing and how on a regular basis to compare it their tax filings.
It seems like this info is being withheld deliberately so the public cannot make assessments of how these digital sales are doing. Instead we have to work with data from the company as if that info is not bias. Oh you sold a million copies of that? Oh well that must be a good game then right? Sales statistics should not be a marketing tool if they are not true.
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