I can understand why Danny and the pprune gang feel that major commercial concerns shouldn't post adverts and vacancies, but I sometimes think that it would be appropriate to allow flying clubs and the like to advertise for instructors and associated staff.
After all, on this particular forum, they're more likely to be reaching their target audience and are less likely to recieve inappropriate applications which waste everyone's time. Equally, few flying clubs are major multinational corporations, and the large majority have limited budgets and resources.
I suppose the deciding factor would be who qualifies for such allowances and who doesn't, consequently the blanket ban.