Read the disclaimer which says "Sometimes the visa sponsors(employers) does not enter a specific salary, but a salary range. Our algorithm uses the middle point of the range to calculate the average salary"

In my example, the form has 50K as the bottom of the range and 200K at the top. Using this site's methodology they take the "middle point of the range" which is 125K.

What your calculating is the example's actual average, not what the site would be reporting. That was the point of my post to show that the methodology likely does not match the truth and likely overestimates the salary.

If the range is $50k - $200k, this survey methodology would put it at the middle -- $125k.