as you might know, on Russian server Wargaming has a very popular souvenir shop. Most of us probably think this can't make too much money, but is it really the truth? The WoT Ekspress VK page got sent some economy estimates of the souvenir sale on Russian market. In 2014, this revenue was around 5,5 million USD (!) and in 2014:
Apparently the market is really massive.