Earlier quoted context omitted.
If someone said they came up with a spreadsheet that quantitatively proves that Homer's Odyssey is a worse piece of art than the Mona Lisa, would you go through their quantitative analysis, or simply dismiss their argument on the face of it? Education's value to society and the individual is inherently unquantifiable with today's tools. Maybe someday we will have a mathematical model of the human mind and a theory of…
Are you saying you wouldn't take a look at this spreadsheet? I definitely would. Though I don't think it's possible it would certainly be interesting to see someone try, and if it failed to be interesting I could entertain myself by writing a comment explaining how they had failed. You say that education's value is "unquantifiable" but that's not quite even wrong. The question isn't "What is the ineffable value of ed…
You don't have to quantify the expected value in order to decide on costs - this is only done as a reductionist homo economicus type model.
For a more direct example, when deciding to go watch a movie, do you do some computation of how much your net worth will increase by virtue of seeing the movie, and compare that to the ticket price? Or are you simply acting on practically unquantifiable subjective feelings of enjoyment about the movie, and comparing the price to entirely different goods (e.g. you probably wouldn't go if the ticket price is 10000$, because you can buy other things you feel are much more enjoyable/important with that kind of money).