Why doesn't have mercury drugstore in all sm supermall?

When Henry Sy (Owner of SM) was young, he went to a Mercury Drugstore to buy medicine for his mother, but because of being filthy and dirty due to poverty when he was young, the guard didnt allowed him to enter and told him to get lost. He replied to the guard and said "One day, when I have my own mall, i will never allow you to enter on it"

My friend tell me that Henry Sy put up a drugstore too before, unfortunately it failed to generate income and he loose a lot of money coz Mercury Drug was a hit that time. Yeah, bitter