Grossjean's Dirty 32

I am contemplating purchasing JG's book as I've heard many good things about it. The info I have seen around on the "Dirty 32" has me quite puzzled. I hear its a set of 32 different Level 10 counts for the 32 most important indices, but how is this feasible? Obviously you aren't going to be keeping the RC's from round to round, right? So are these counts powerful enough to have an effect on only one round of play? Doesn't seem possible, but perhaps I'm missing something. I don't expect for anyone to spill the beans here, my intention is not to blow up JG's spot. I just would like any info anyone could give me to help me understand the idea behind it. Thanks