Who? Me. Over years with several sites. Sometimes I lost some bugs but overall I got a very good income with "scamming" real scammers. Have a look to my simple rules. High risk = low investment / low risk = high investment. Spreading is important and NEVER BE GREEDY.  
It´s mostly not important how much you invest - important is the time - quick-in/quick-out. (BTW: Sunpower18 is only an example of my investments - I´m richer than him )

All other income I made via BTC-e&Co. ATM with chinese trading-sites without any scammers - so I have to be a night-worker. I know the potential of BTC since 2009 and it was and is much better than all other curencies (but ETH).
Three screens, one is: http://bitcointicker.co/

best regards