In many places it’s either not an option or not one that you’re going to find almost anywhere most people shop. As far as I know in my city the only place to find real bread is Whole Foods (where the inventory is limited and inconsistent) or the one independent bakery that happens to sell sliced bread. And it’s a Japanese bakery, so I would guess almost nobody would even think to look there. Almost every other bakery is selling bullshit like cupcakes.

It also costs $5+ a loaf when you can get the cheap stuff for $1-$2, so a lot of people just wouldn’t spend the money anyways because they don’t know or care about the difference.