Thanks for the reply and yes I do realise you can be in a pool but is seems its not very profitable unless you are using virtually free power. For a dedicated mining company the costs to mine at least one $1M Bitcoin every 10 minutes it would surely mean the cost to get that coin must also be approaching $1M. Presently it takes ~150,000 kWh to produce one bitcoin on average so as the value of the bitcoin increases the cost to produce it must also increase.
And what is the point you are trying to make? A one of a kind global decentralized payment system worth $20 trillion (assuming $1 million price and 20 million supply) should cost a significant amount of money to secure. It doesn't matter how much electricity it consumes since it can provide a much needed utility to 7 billion people. 
Topic: Block Rewards when Bitcoin hits $1M - page 2. (Read 255 times)
You are forgetting about halvenings, if currently a block rewards 6.25 BTC x $37,000, in the future it could be less than 0.6 BTC x $1,000,000. So the power consumption of the whole network could be less than what it is now.
It's irrelevant how much energy it takes to mine one whole coin, because no one really cares about whole coins, miners just want to make profit from whatever the block reward is. And since nearly everyone mines in pools, they will be getting just some milibitcoins from each found block.
Who then would be able to afford the cost every 10 minutes, and would this "cost to mine" be a sum of the costs of all miners?
It's irrelevant how much energy it takes to mine one whole coin, because no one really cares about whole coins, miners just want to make profit from whatever the block reward is. And since nearly everyone mines in pools, they will be getting just some milibitcoins from each found block.
Bitcoin mining has been always profitable and will be always profitable.
Will you mine bitcoin if it costs you more than the price you can buy it in the market?
If the money someone has to spend for mining 1 bitcoin is higher than bitcoin price, the person will no longer mine bitcoin. This causes the total hashrate of the network to decrease. With the decrease in the total hash rate, the difficulty and the mining cost will decrease too. So, mining is always profitable.
Will you mine bitcoin if it costs you more than the price you can buy it in the market?
If the money someone has to spend for mining 1 bitcoin is higher than bitcoin price, the person will no longer mine bitcoin. This causes the total hashrate of the network to decrease. With the decrease in the total hash rate, the difficulty and the mining cost will decrease too. So, mining is always profitable.
Thanks for the reply and yes I do realise you can be in a pool but is seems its not very profitable unless you are using virtually free power. For a dedicated mining company the costs to mine at least one $1M Bitcoin every 10 minutes it would surely mean the cost to get that coin must also be approaching $1M. Presently it takes ~150,000 kWh to produce one bitcoin on average so as the value of the bitcoin increases the cost to produce it must also increase.
.........Who then would be able to afford the cost every 10 minutes..........
Even if bitcoin reaches 1 million dollars and the mining cost increases significantly, people can still join mining pools and continue to mine bitcoin. You don't have to mine a block alone. Note that even now almost no one is able to do so and people join mining pools. 
If, and when Bitcoin reaches a FIAT value of $1M one would assume the cost to mine a single coin would be quite high otherwise everyone would be doing it. Who then would be able to afford the cost every 10 minutes, and would this "cost to mine" be a sum of the costs of all miners?
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