Top contract is $7000 for 50 Mh/s?!?! You are kidding me? If that is the case I will set up a cloud mining business with my Antminer U2. 2Ghs /50 Mhs @ $7000 a time = Kerching!
You need to do a little more research. Those prices would be for someone selling hashing power for altcoins with different algorithms such as Scrypt and X11, of which most have not had any ASICs developed for them and hence hashing power is comparatively expensive.
My bad.