There's nothing wrong with public school teachers selling longganisa or Avon products or tutoring kids. The problem is when they do this in school. What Norma Dollaga claims as dignified, honest, and creative becomes embarrassing, coercive, and trite when done within the school premises. Homeroom period becomes "selling time," depriving students of that extra hour or so needed to discuss class business.
The bigger problem is when the teachers force the kids to buy. Ask any public school parent and they will tell you about teachers requiring kids to buy merienda from them or withholding test papers until the purchase whatever it is they're selling.
The Department of Education issued a memo years ago allowing teacher's associations to own school cafeteria coops to augment their salaries. This has since morphed into teachers requiring all students to buy meals from them regardless whether they bring their own baon or not.
Teachers' salaries are, indeed, very low, but calling their illegal and unethical stop-gap measures "dignified, honest, and creative" reeks of reaching. Blame the government or the economy, but don't praise these oppressed teachers for passing down the oppression to their poorer students.