easy way to make money !!

One of my friends told me this, but i never though people are earning more than 25k USD for a day ??? idea is simple, buy credit say woth 500 USD, and exchange it against depreciating currencies... for an example $ is deprecating alot these days so, you can buy GBP against USD and exchange it then in real time basis. I brought 500 USD and made 750 USD in 5 mins !! ohh yeah in the demo mode ;) this grate software is "eToro".