to the guy with $40
the $100 thing makes more profit...
By $100 thing, I'm assuming you mean mining and if so.... no thanks. I have my own mining equipment, and if I wanted to buy more ghs I would probably just add another card or two to my rig. That being said; mining is not getting easier and the income will decrease monthly, purchasing a mining contract is a good way to lose money in the long run.
Also mining shares dont return principal. No one in their right mind is buying them now. Its an almost certain loss at this point and gets worse each time the dif goes up.