I think this was actually changed to the lower prices very recently due to another suggestion partially because cauldron cakes were very cheap on server shops since free bread is no longer an option. So cauldron cakes were made more expensive and bread was lowered as the user in the other suggestion wanted to be able to compete with cauldron cakes since it is a custom candy. This is primarily because the purpose of selling food from server shops is for newbs to have easy access to it, so they need to be able to afford it as well. We also attempted to make the bread price comparable to real life bread prices in London.
With that, I’m unsure if owners would decide to change the prices again so my personal suggestion would be to find another food that isn’t sold in server shops or is sold at a price that is easier to beat for you or to sell bread at a loss and make up for it with other items.
Anyone feel free to correct me or offer a different solution.
ETA: Wrote this from my phone so kinda messy, but this would likely apply to other foods you noticed as well. Non food items could potentially have a different solution depending on what it is.