I am sorry, but to complain as a foreigner if I have to pay 10 or 100 PHP for entrance fee I must be a real bum. It is very shameful to be confronted with statements like that.
Me living in a mountain ressort of Switzerland enjoying as well cheaper tickets for the skiing and cable cars. Otherwise we would as families not be able to afford to go there.
It is not only in the Philippines like that. It is all over the world. Hope that those foreigners complaining will pay their share to see the beauties of the Philippines, they were able to afford 50'000 PHP for the ticket to fly there so why not paying a few extra Pesos for entrance fee?