This is a report of the report. The second quote explains why.
Short form:
Quote
Nearly 500,000 people in developing nations earn a wage making virtual goods in online games to sell to players, a study has found. ... The industry, about 80% based in China, employs about 400,000 people who earn £77 per month on average.
But in a statement to make any Scientist cringe:
Quote
But, he said, the true size of the sector was hard to estimate - it could easily be twice as big.
Heh. No idea how they "researched" this is if they basically concluded a number with a +/- of 100%. It's like a LoTRO-like "we have a million characters". But at least there's a number now.
In fairness that may not be an error range but what they take to be an extremely conservative estimate, thus they might allow for a greater number but don't expect many less.
"Look at my car. Do you think that was bought with the earnest love of geeks?" - HaemishM