I read yesterday about a cloud hashing service. You paid $150 in BTC for a 1G/Hash slice of a 1T/Hash machine for a year. Or paid $250 (in BTC again) of ever. W

I read yesterday about a cloud hashing service. You paid $150 in BTC for a 1G/Hash slice of a 1T/Hash machine for a year. Or paid $250 (in BTC again) of ever. With an expect return of 5 BTC per year and 6 BTC per year respectively. The site offered 6000 slots available and the machine would be up by June. My problem with that is it seems just like a scam. They are making $900,000 up front in an untraceable currency. They are proposing that you'll get an annual return of $720 at yesterdays rates. My gut tells me that if its sounds too good to be true it generally is. Gold has value in that it can be made into something, bitcoins have value only because of the perceived value. How is bitcoin different from the ponzi membership badge I have? What is going to make bitcoin still worth something in 10 years time, as in what's holding its value up other than perception?