Many people (CG or not) find that they can't use the same products for long periods. They stop working, or there are other issues. Having 3 or 4 "sets" of products to cycle through can keep you from having these issues. You would use each product once or twice a week and reduce the chance of this type issue. Also, using CG you have to be extra careful to cleanse the scalp so that oils and sebum don't build up and cause other issues.
Experimenting with too many products to name here. All this great info keeps my head spinning.