We were told by UWC a few years ago that 50% of parents paid their own fees. However, when I have spoken to friends of mine, although many pay their own fees, for some, the company gives them a salary enhancement to cover the cost. So it's not really the same as paying their own fees although if asked, they would say they do, as they write the cheque out.
Yes, I guess that was basically my point. Just about anyone on what is considered 'local' terms will have made sure the salary is high enough to cover international school fees. And don't forget that Americans who get school fees paid for by the company still have to pay taxes on them given company paid school fees and housing are considered taxable income.