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they weren't worth the electricity they cost to mine...I'd love to mine a bitcoin a day on my PC now...you can!... but they wouldn't be worth the electricity now either. the cost of mining (amortization of hardware costs plus electricty) is the value of bitcoin. if bitcoins are a bargain to mine, more people will mine them thereby reducing rewards.
should you have mined more back then if you had magical perfect knowledge of the future? no: they weren't worth the electricity.
instead you should have bought more of them back then.