I learned this lesson the hard way too when I was younger. It was OG Runescape, a simpler time, but full of dirty trolls none the less. This player had a great gig going, he was "doubling" the gold people were giving him. And it seemed legit. Everyone at Varrock was doing it, and they all were thanking him graciously. Or so it seemed, now I'm not sure if these were people part of the scam or he was just waiting to pull a large enough heist to make up for what he was actually giving out to people. I was tentative at first, gave him a small amount of my gold, and he doubled it, I did another test, this time with more gold, once again, doubled. By this time I was thinking, wow this guy is genuinely interested in helping people. So this next time, I gave him ALL the gold I owned, which was a f*ck ton, like shit man, it was a lot of f*cking runescape gold at the time. And sitting there, with a twinkle in my eye, I watched with horror, as that f*cking dick starts sprinting his giggling ass away. Devastated, I follow him, screaming, shouting at him in chat. He logs out. along with all my hard earned gold. I raged, vowed never to play again blah blah. BUT, I learned a valuable lesson, don't cry..., don't feel sorry for yourself..., learn from your mistakes... And I did. I became that doubling douchebag, I began running my own scams on naive victims, and I made more gold doing so than I ever had before. If you can't beat them, join them. I thank that evil genius.