As long as human beings still have the greedy and selfish nature, there will be people who continue to build mines and nodes for Bitcoin to get profile. These actions convert the energy in human nature into electricity and then into hash rate to support the continuous development of Bitcoin.
It isn't just all about greed when people keep on building mining farms for bitcoin. Well, they got the capital and they sure will have to get profit but it's also helpful to maintain its network.
You are thinking the negative side for someone who doesn't mine but I think for the perspective of miners, there will always be the good side of it.
Here, I don't think miners are the negative side. Instead, I think miners are an important part of the bitcoin network. What I want to express is that it is profitable to earn bitcoin by mining. As long as there is profit, there will always be miners, and the bitcoin network will never be destroyed.
They are very important, without them, the network won't be secure and there will be no confirmed transactions. What you've expressed is true.
It is profitable for them and if somebody wants to mine as well, he has to learn first what are the needed things to run a farm. You can mine with a few miners but calculate all of the investment and possible ROI when it shall come.