I think it is very possible!
It still be the same as you would sell food, but now you sell service and maybe some shampoo too.
You probably would list your service price as product in samba pos, such as hair cut, hair coloring, manicure, pedicure, etc.
The only thing that samba pos can't do right now, if you sell some product with expiration date. There is no such option for right now! So, for supermarket that sell product such as milk with the expiration product can't use samba pos, as well as pharmacy that sell medicine with expiration date.
Maybe emre might want to implement the expiration date for the samba pos in the future?
I know some in my restaurant we use some product in cans that have expiration date also (such as corn in a can, milk, syrup in a bottle, etc), but that is not a big problem for now, since we use them up before they expire.
Just my two cents!
Regards,
Leon.