Its amazing that you would imply others are of lower intelligence than yourself when you ignore the very base and simple concept of:
It is impossible to predict future price
It is impossible to predict future price
It is impossible to predict future price
It is impossible to predict future price
So yeah maybe that 5830 will never make you $160. Or maybe it will make you $1600.
Would you ever be better off than if you just bought a suitable number of bitcoins for USD directly right this instant, though? If not, it's entirely pointless to buy one for bitcoin mining at that price.
Because when you buy a rig, many people see it as an additional hedge...If bitcoin goes to $0, they can still sell this rig for some amount of $. If they invested straight in bitcoins and that happened, tough luck.
Plus all the stuff Yeti says.