The rising BTC difficulty is something to consider. I've been dabbling in the ETH contract instead. Like mike has mentioned, it lets you automine the most profitable altcoin and convert it into BTC. You may be better off going with that instead. Start of with 5mhs of so and see for yourself. 
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Will give it a shot. The difficulty has been going us and it is very obvious in the daily payout that has been dropping for the past 2 months now. Might make a separate post once I have enough data.