Investing involves more than putting all your resources into one pipeline. While we definitely purchased large amounts of BTC at the time, mining helped offset the long term risk associated with market volatility. Mining provided steady and better predictable results to support the uncertainty therein.
There's 2 ways to get bitcoins, buy them or mine them. I'm having a hard time seeing how getting 46 BTC rather than 70 BTC is offseting the risk. Why would you want to mine less than you can buy?