I don't think it's mostly snobbery. They carry products that are perfectly fine, but they also sell things that (in my view) are just wrong. One simple example

I don't think it's mostly snobbery. They carry products that are perfectly fine, but they also sell things that (in my view) are just wrong. One simple example that comes to mind: crisps. I don't know what they do with them, but they tend to be WAY overseasoned. And that applies to salt, pepper, paprika, etc. A significant amount their products have this problem. Now whether that is worth a premium to you or not is a different discussion. An actual M&M still tastes better than their copycat equivalent. I'm not saying the mainstream brands are always good, definitely not, but I'm happy to pay for some of those things if the quality is better. Just like I don't mind paying for fresh fruit / veggies / meat / chicken etc. Also, to add to that, the "house" brands (i.e. for milk / sugar / etc) of most more expensive supermarkets generally tends to not be much more expensive than Aldi.