Greed is one of the driving force which had led a lot of people to invest in high yield investment scheme which turned out to be a scam in the he nearest future. If you can put your greed in check then you can actually avoid in investing into unreasonable stuffs.It is not easy to completely avoid them, but you just have to make up your mind that you will never be greedy and do not ever accept anything that guarantees you high return for little investment.