Yes, they do what is called "selective" scamming. Happened to be awhile back for over BTC2.5~
Unfortunately when 90% of the customers do not get scammed like the other 10% its very hard to convince everyone they are ALL at risk!
That's messed up. What do the ''selectively scammed'' people do, just take it?
Selective scammers ca be anyone, Even a trusted member of this community, Once that member has enough reputation, The can start to scam one person then later maybe a few month they scam another person, You have to be careful here, as you try to convince someone they wont believe you like they're ghosts or something...