Perhaps because there is nothing to indicate that it is a serious business? Even if you ignore the ridiculously high profits they are claiming, the whole site is just silly. For instance they are not showing any of the information any proper business in the areas they claim to be dealing in, would have.
0.5-0.8% each day from arbitrage is ridiculous? Looks pretty low to me.
I can understand that most people don't know what to look for when it comes to arbitrage. However, in the mining part pretty much everyone should know enough to ask for what kind of hardware they are using, and the amount of Ghash the shares represent. BTs problem is that if their customers had those numbers it would be easy to calculate that they are lying about either the price of the Ghash, or the profits.
AFAIK they aren't selling you GHS like Cex.io does. they are selling you a contract for a year.
The information you are looking for is here: https://bitcoin-trader.biz/mining.php --> ~10 TH for 1700 shares so each 100$ share rents ~5,88235 GHs for a year.
As of today there is no longer reason to buy a mining share: their cost is a non refundable 100$ for 365 days with a decreasing daily return of 0.26%. 365*0.26 = 94.9$ for a cost of 100$.
