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mining sets a baseline, if i am using 100$ worth of electricity to mine 1 ETH, then there is no way a miner will sell it below 100$, thus creating a baseline...
First of all, you're talking about the price, I was talking about decentralisation.
Second of all, you're wrong. People, including miners and traders, sell at the loss all the time. It's better to sell at $99 and lose $1 on every 1 ETH mined, than to hold and watch it drop to say $50 (losing $50 per 1 ETH mined).
Rational
miner (not gambler or speculator) would just halt his mining operations when price < cost, which in turn reduces difficulty and the cost (forming price/cost equilibrium).
Otherwise, lets all mine BTC with our laptops and watch the price moon to >$1 million, right?