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(£Ð^,6dy¡HSjÆbLSunk cost fallacy. Once you have mining hardware all you care about is variable costs. Mining hardware costs only affect whether you buy more hardware.
https://whatsonchain.com/tx/8d6b0b94d2a9c3882f4d31cd80220d2846cdcfbfb425e22d3d844c7d8c7e7a9a