Ya think?
Let me give you an example. If you mined BTC right now at exactly $500 USD trade value and earned one BTC but it costs you $10 in electricity. But then held it for a month until BTC goes back up to $650 did you not come out $140 ahead?
In this example you saved $10 in electricity while I made $140 for a difference of $150.
No, you came out $10 down as you could have just bought the BTC instead and been $150 up instead of only $140 up.