This is a totally misleading calculation for the largest currencies. It's literally quoting the spot price for what's available on NiceHash and then dividing by the fraction you'd have of the total hash rate.
In reality, as you continued buying up hashing power, the price of the remaining hashing power would go up precipitously. This is basic supply and demand.
In reality, as you continued buying up hashing power, the price of the remaining hashing power would go up precipitously. This is basic supply and demand.