brudder, u trying to dry some dirty linen in public issit? ;p
anyway, i think all depends on the schools as well... (i dun work in MOE, paiseh or even any affiliation) but i do understand that schools have budgets, if they dun, they can get from students, either from parent's sponsorship or watever you call it, its there all these while but nobody notice, esp the locals, during my secondary school days, i remember every year, target is the foreign students, we are 'encouraged' to donate to the year book, either per page or per 1/4 page, den students who often get clashes with schools and 'wish' to remain will 'donate' more... den also, if we break any minor offense, we just 'donate' a table, chair, bench, pc, etc... u get the flow... so school will get more reserves... paiseh, if MOE wanna pursue, i think its like 10 years ago... invoice throw dunno where liao... oh ya... its not we buy to give school, we give cash den school give receipt...