I think some people just don't like food very much. Seriously. They eat to live, not live to eat. In that case, anything spent above a sustenance level is wasted money. These are the people soylent was made for. Even better a DIY soylent.
I'm definitely an eat to live type, but I'm still really invested in the grocery shopping experience. And it's sort of because I see grocery shopping and food prep (and eating) as simply chores that need to be done. I've got a low tolerance for things not being enjoyable, so I have to make chores interesting. Before I got a washing machine, I used all the laundromats in my neighborhood in rotation, just for the excitement factor (fortunately I am also easily amused).
So, unlike my neighbors, I've been to all the grocery stores in my neighborhood and have opinions about them. I scan the sales they advertise in their windows on my walk to work to choose which one I'll visit on the way home that week. Once in the store, I enjoy doing comparison shopping of prices/oz or whatever, because I like being actively engaged. I like building meal plans in my head based on sales. Simply as a logistics problem, less about the sensual pleasures of food.
So to me, it's wonderful to take something that could be boring and unpleasant and make a special occasion out of it. I don't like the high end stores like Whole Foods or Trader Joes because I don't want to spend extra money, but stores like Wegmans--while they do have some expensive stuff you need to avoid the temptation of--can be a fun experience for the same money you would have spent anyway.
I come from a 500,000 year lineage of successful hunter gatherers who got a hit of dopamine every time they procured food. It is not odd that I enjoy/also get a dopamine hit from procuring food (from a grocery store, from a cherry tree, from whatever.)
Seems like a good explanation to me.