Operating cots very higher and result from mining very lower its why I am not back with mining now, last two years maybe we can get much profit with mining but now better you buy or invest your money in altcoin and bitcoin than you want to start mining project, every day you have pay mining operating from electric to your internet access and many service needed every week for you mining tool, you have much output for you mining tools.
And basically, the reason why the cost is increasing is because the fees is so, let's take for example, bitcoin halving provides the blockchain a division of mining rewards from its current state, in this case, miners will receive less rewards from the transaction or work that they've done. In contradict to it, the halving should take's place only on cryptocurrency that has a potential market value increase. Through this, if there's less reward, its market value still is great.