Private Schools: When to take Charity Status away

A few days ago a headmaster at a leading UK Private School said that he could fill all places with overseas students if he would wish to do so.

That he is not doing it may seem to be altruistic, but I guess the public backlash would be just to violent to contemplate.

But it is still remarkable how large the foreign contingent has become during the recent few years. Maybe this is due to excessive greed shown by headmasters and their 'trustees' (usually harmless bigwigs that eat from the headmasters's hand).

Is this not pure commercialism and would it not be appropriate to treat these 'Private' Schools as businesses for tax purposes?

The fees that are being charged are being pushed to astronomical levels due to the demand pressure from foreign student applications. How can one justify 15 or 20000 pounds per annum for non-boarders? Assuming class sizes of 20 and one teacher per class (pro rata), add minimal admin staff (no headmasters sitting idly in the office, pontificating, not doing any teaching at all), some costs for property (who needs five-star luxury, labs where students play around without learning a craft in the end) and one arrives at 100-120000 pounds per class, that results in about 5-6000 pounds per place.

Question: where do the remaining 10000+ pounds go to? Excessive teacher salaries? Unnecessary facilities, dubious purchasing policies?

No one knows, or has any ordinary parent ever had access to full and audited accounts of a Private School?
Evening Standard