The Charlotte Mason Method requires a complete fulfillment of time by a child's parents in order to work properly. The parent must instruct the child in a particular way almost every single day, and must be committed to answering any questions a child might have and providing full explanations. For parents that do not have a lot of time, the Charlotte Mason method may prove to be too demanding and will not be nearly as effective as some alternative methods.
The foundation of the Charlotte Mason Method are the living books that are used to teach a child. These books must be available for a child on every topic that it is necessary to teach him, and therefore these materials must be located and purchased. These materials will accumulate, but they will need to be kept so that a child can refer back to them. There must be a place to store these materials, as well as a place to find them.
Between the time necessary to teach using the Charlotte Mason Method, and the extent of materials that must be purchased, the method can end up costing quite a bit. It is true that some of these materials can be found at a public library, which will cut down on cost, but the child will not have them to refer back to if necessary.
In the end, a child that is taught using the Charlotte Mason Method will have a different experience than his peers that were taught in a group setting. If everything is taught to the child properly, this may not be too much of a problem when he reaches a higher education setting, but can influence his social experience once he leaves homeschooling. The Charlotte Mason Method may be more engaging for a young child, but can cause some stress for him later in life.