I had a small colmado here in El Seybo. I started out just selling meat, chicken, pork etc. I then expanded to beer, rum, water, flour, sugar, candy etc. I have a small (15' X 12") in front of my house on the street and sold from there and I live in a very poor barrio. There is a big freezer inside the store that I used for the meat and beer and the electricity is from my house.
As it is so small my wife or her mother would operate it which required no salaries to be paid so my overhead was minimal. I was not registered with the state, like so many small colomados, so therefore paid no taxes directly. Because of not being registered I was not able to buy at wholesale prices but would receive a discount from distributors therefore my profit margin was less then a registered, licensed colmado.
My biggest profit maker was bags of water 125%, beer 22%, rum, 31%, candy 25%, meats 16% for pork and 22% for chicken, flour 12% and sugar 13%. With these figures my net should have always been above 12% but after operating for 2 years I could never get it above 2 % and therefore closed it down because the work and aggravation were too much for such a low profit. Where was my money going each day? I have no idea and I investigated it and to this day the only thing that is possible is that my family was pocketing the money but I was never able to prove it.........
I think there is money to be made in a colmado if the location, employees, and owner are good and more money is to be made if you are licensed. A must that is needed is that the owner MUST be able to speak Spanish.
Don't know if this information will help any but those were my experiences in this endevor.
Rick