How to compute ROI ?

At the end of the day, you want to see if your marketing dollar is producing the expected ROI. It should, given that Word Of Mouth drives nearly 50% of all purchases happening in this world.

With the Word Of Mouth metrics gathered, you can enter your marketing cost, traffic conversion, gross margin numbers to compute the $$ Value of your Brand Advocates, and whether you can profitably convert one Unhappy Customer to a Brand Advocate.