That's assuming that the price of Bitcoin isn't going to rise. People often forget to take that into account when calculating profit, if you are going to buy Bitcoin and wait for the price to rise you'd be better mining.
With C$ 900 (US$ 825), I could have bought 1.875 btc now (bitcoin price is $440 at this moment on bitstamp).
With C$ 900, I could have bought a 150GH/s contract from you, and it will generate ~1.15btc in a year (with no fees and 10% difficulty increments everytime) or ~1.78btc (5% difficulty increments).
No matter bitcoin price will be $100 or $100000, it is still better to buy bitcoin directly.