I didnt see anyone purchase the matza bags. I think it was no different than Zip Lock bags except someone called them Matza bags
I rarely shop at regular stores anymore so I didnt see anyone buy chametz on Pesach and If I was driving past such a person walking into the stop and Shop or key food, I wouldnt have known they were jewish
By causing people to purchase more expensive non-gebrachs you are taking food away from poor single mothers with kids money for food to support your chumra. Chumra arent in a vaccuum, Kol Bnei Yisroel Arevim Zeh Lo Zeh and you are causing these people to starve