Only Blizzard could tell us.
I'd estimate around 1.4 million on our server.
Where did I come up with that random number?
35000+ trade channels each with 40+ people in them on average = 1.4 million.
- I assume that each channel is active (a major assumption)
- I assume each channel has 40 people (even though many will have more and some will have less)
- I assume 100% of the gaming population has trade channel on at all times (clearly not true)
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