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.
All mining enterprises that sell hashing power are a loss for the simple fact that difficulty increases are shaving the profit potential for everyone at a steep exponential rate.
Enterprises that get state of the art engines and are sited at low Energy cost places may make a profit.... even they are nervous. 20nm and 14nm chips are on the horizon. They will render the bulk of the mining rigs obsolete in 12 months...
i sincerely doubt anybody buying has from bitcoin trader (or anybody else) will be able to make a profit.