People have explained all this shit to you, so no need for me to go over the same thing agian.
But honestly, just use common sense. If someone says: ``send me 50$ tommorow send back 500$`` would you believe it? They might have a secured and fancy looking website to fool you. It happens in just seconds, you forget to turn on the common sense switch and boom, you`re scammed. Just think about it, this is too good to be true, and it is. So yeah, final thoughts: Just do not buy it.