Hi. Found this server:
Their page in social network site: https://vk.com/scumrp
Look closely - admins sell in-game items for REAL MONEY.
There's even the price list. Unban, for example, costs 300 rubles (about 5$), pack of ammo is 30 rubles (20 cents). There are even hacked items for sale - for example, N9 bayonet that kills in 1 hit (normal one require like 10-20 hits) for as little as 250 rubles (4$).
How their fraud scheme works:
Player joins their server, because official servers are empty. Admins insult player, kill him, etc. Player insults them back. Sentence like "WTF, man?" is enough to ban a player. Then, admins contact the player and offer him unban for money.
They try to accumulate as much players as possible, let them play for a while and then player pays them to not lose countless hours he invested in his character on certain server.