Hard to say as determining the ROI would be based on your business model, reporting requirements, cost of implementation, current costs, etc.
Crystal has some worksheets that they sometimes share with certain customers to help determine costs of implementation, and you can calculate cost of acquisition and ownership relatively easily, but you'd need to know what your current costs or projected costs are for the same services to be able to use ROI effectively.
For the most part ROI is a buzz word these days and in my estimate, rarely accurately used.
The biz babble behind, Crystal (BO...) has numerous licensing types, and they will work with you to tailor something if they see $ coming in.
Contact Crystal and ask for their help, they'll send out a sales person with a demo, etc.
-k