"In the first week of 2014, $400k was paid out to content creators", noted Valve during the second Steam Day (summarised on Steamdb) - those content creators being people like you or me who belong to the Team Fortress 2 or Dota 2 communities.These people make their own items to sell to the rest of the community and, judging by the numbers, sell them they do.
Valve believes many current micro-transaction systems create unhappy customers - what, really? - who end up training themselves not to spend money. Valve's solution is to let users make value for each other, and reward players who make the most.
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