I was going to save this for another publication I am working on but here goes...
I believe that Dad Stevens used the Riffle Cull to assemble 'three of a kind' on the top of the deck to add an additional split to the Faro deal.
I believe that the magic community has misunderstood his line 'three will get you the money' because we/they automatically assume he was talking about poker rather than Faro.
If you study faro, you will discover that one of the ways, an ingenious way, to create a split - a point in the deal where both cards appear of the same value - is to bring three cards together. That, I believe, was Steven's advantage in dealing the game.
Of course, the expression 'three will get you the money' applies in poker. Few, if any, have noticed up until this point, however,that the Stevens Riffle Cull was designed primarily for Faro.
This is more than I wanted to say about it at this point in time, and as Derek now knows, I wasn't particularly thrilled that he posted the reference on the Forum. But, now that it is out there, I hope this brief explanation will help clarify things until such time as I release a larger work that includes an exploration of Stevens' work in more detail.