There are several reasons why now the usual mining is unprofitable and this: the equipment for mining the crypt costs a lot of money, and its payback under current circumstances will be very low, no one excludes the markdown of equipment that becomes obsolete very quickly, high electricity costs, mining crypto-currencies is beneficial only in those regions where electricity costs a penny, huge competition in the mining community also does not allow beginners or people who have weak equipment to fully engage in coin mining.