The ROI is there. While there is no cost to the product, there is an infrastructure cost. ROI is realized in time savings, and in community-based products, the major investment is your time. 

If you integrate with other products you can do fault tolerance, too.

The bottom line is that the ROI is there provided you invest your time in it. If you do then you will be well paid for it, because the product will help you to easily grow your environment, and make it scale faster.