Question

Why is the value of community organizations and cooperatives difficult to measure?

Answer 1

Because when you're talking about 'community organizations' and 'cooperatives' it's very hard to define what the quantifiable outcome that you want to measure would be. This leads to difficulties in determining the value of a certain organization such as these two. 

Answer 2

Because there is a difficulty in quantifying, putting in numbers, the value of community and cooperative organizations. So the conclusion is simple: If you can not quantify you can not measure and if there is difficulty in quantifying, there is the same difficulty in measuring.