The temptation of savings: from my experience when it comes to food, once I have tasted a superior product I find it very hard to go "back" to the cheaper inferior product... more so than say stationery, clothes, toiletries etc. I can think of at least 10 foods that I now eat regularly despite them being significantly more expensive than what I had before... here's 3:

Bread: before i had tasted Phillipas I thought all bread was pretty much the same. Phillipas loaves cost up to $8 each... but I would rather eat less of hers and taste something truly delicious (appreciating every mouthful than mindlessly consume just another slice of some standard supermarket bread... well, on the weekend anyhow ) I think Phillipas uses organic flours and ingredients too although I could be wrong.

Yogurt: expensive organic yogurt is a totally different product to the stuff they try to call yogurt eg Nestle's which IMO is just sugar, milk and thickeners. We now eat Jalna as a staple... not cheap but i can't bear the thought of my kids eating the other rubbish. There are also other favourites that we buy less regularly but think the extra $ is worth it.

Chicken: a corn fed free range chicken is smaller than your standard battery supermarket chicken and it's often twice the price but once you've had the real thing it's very hard not to taste the bleachy excuse for a chicken that most supermarkets sell. If I'm going to go to all the effort to make a Coq Au Vin it's only going to be a free ranger from now on.