By George, you have got it, countryboy. There is no way one can measure value to society of scientific research. Scientific research is like groping in the dark. Many times you don’t achieve your objective, you may end up somewhere totally different. Sometimes you don’t get anywhere, the research may end in a dead end.
It has happened on occasion that a scientific concept lies gathering dust on a shelf for a long time before somebody sees the value in it, the practical application to it.
But think about it, what value is Big Bang Theory to the society? How is the society better because of Big Bang Theory, except in an abstract sense? It may be 10 years before somebody comes up with a practical application of it to benefit humanity, it may be 100 years, it may never happen.
Yet we have spend substantial amount of money to study the Big Bang Theory. Scientists study with the purpose of acquiring knowledge, benefiting humanity is not one of the aims of science. Technology achieves that, and there can be no technology without science. So you could say that indirectly science has benefited humanity tremendously. But science does not aim for that. Science is pursuit of knowledge for its own sake.