I think that the very meaning of "value" is and ways has been nothing more than a single word without a real physical meaning. Value is an abstract feeling. A feeling of desire. Biologically, our desires are wired into us and always come down to necessary human requirements like food, love, safety and so on. So value is whatever we feel like it is. However if you are talking about monetary value, electricity, miners, internet and rent is not free. So making Bitcoin costs money.

Those Bitcoin mining costs are the non speculative, translated value.