"some people want to pay" is not sufficient to justify implementing a "freemium lite" (term is my own) version as advocated in the article. How many people will

"some people want to pay" is not sufficient to justify implementing a "freemium lite" (term is my own) version as advocated in the article. How many people will pay? How much will they pay? Is the product of those two figures in the same ballpark as the cost of developing the "freemium lite" differences, accepting payment, dealing with support emails from people who expect things they pay for to Just Work, etc.?