The point of the exercise
The point is that even with fabulous cards and a huge count, horrible things happen. If one does this exercise enough (and 100 hands is not enough) then you will find the dealer pulling 3 21's in a row with a 5 showing, or the dealer getting 10 BJ's for your 1. Just enough to make you realize that even with a huge + count, life can really suck. And with these cards, that's exactly what happens, either you get a great run of cards or the dealer does, there is not much middle ground. It gives an experiential idea why the variance is so large when the count gets high.
The point.
--Mayor