The smaller miners are mining expensive coins, where the larger farms have the financial resources to plant themselves in more than cost and tax friendly regions. On top of that, they can also demand far lower electricity prices by promising to purchase an insane amount of gigawatts every month. Miners are wanted buyers because they are very consistent with their electricity consumption, which means that the electricity supplier has to waste less of its own resources to make sure you get what you need. We as home electricity consumers are the worst in that regard -- we are responsible for one of the highest percentages of electricity waste in the world.