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.
That's irrational logic; because the price of Bitcoin changes, where as the fee we charge does not. If Bitcoin rises even a fraction in price then you are better getting a mining unit.
Even at the $500 mark for Bitcoin you'd make more Bitcoin with the $900 in mining contracts, and still have the upside potential to make more on the returns.
Are there going to be occasions where during a dip buying the bitcoin would be better? Sure, that will always happen in Bitcoin. But more often than not it's worthwhile to get the miners - plus we're throwing this all back into supporting the network with Bitcoin nodes!