Well..I`d listen to Kimmi as she actually runs a store..
Watch the centavos and the Peso`s will look after themselves!!
A sari sari stores success depends on three things IMO..The first is location..The busier,the better.
The second is are you prepared to sit there from 6am to 10pm every day? Thirdly,make sure you have a complete variety of stock..A one stop shop..
Do all that and who knows..You could even take as much as PHP10,000 a month!!
Seems like a lot of hassle for making peanuts to me..