Let us assume that there is in fact a transcendental self, which is responsible of the empirical one we experience. The transcendental self cannot be experienced, but it is the condition for the possibility of experience, the space, so to say, where experience can take place.
Could one not argue, then, that we need a more transcendental self which make the transcendental self possible? If one has acknowledged once the necessity of something beyond experience in order to account for experience, how can one stop requiring always higher order entities to justify the previous ones?
In other words, how can we be sure that the homunculus (if there is a small man within oneself which controls the external man, than one could argue for the necessity of an even smaller man within the small man and so on) argument does not apply to the Advaita Vedānta self?