I referred my sister last week and I got a discount. So I am going to throw this out there in case anyone wants to try it:
Speaking just for myself, I've looked at personal finance Sankey diagrams on Reddit many times and never understood what use they were to anyone, what actionable insights were provided that you didn't already get some other way.
Different people consume data in different ways. For some, data is easier to understand when arranged in tables, black on white, as they can skim through a lot of datasets quite easily.
Others benefit by a colorful, graphical representation, which Sankey provides.
From my experience in consumer facing applications, I'd assume that a colorful, flashy, nice-looking Sankey could boost sales. People prefer things that look nice.