For different countries $20 costs different, but in any country you get the same money from mining.
Of course you have to make different things for mining. Cooling, maintenance, protection, electricity and internet problems, etc. As i said - mining isnt passive income - this is a job.
How is mining a job? You don't want to do anything and earn money? Lol is mining working under a boss or company? Do you have to answer Yes sir to someone to get paid? You are the boss of yourself and you are the one to decide how much you will be earning everyday, mining is far marginal to job
How much GPU do you have? How much time you spend every day to solve mining problems? How much money you spent to buy equipment? Etc
I can tell you one secret - job is not only sitting in comfortable office all day long.
And tell me one more thing - if mining is so easy and we are getting money for nothing why everybody does not mine?