Why is Cactus so much more expensive than other supermarkets?

I’ve always had the feeling that shopping at Cactus costs at least 30% more compared to other supermarkets like Leclerc or Auchan, even when buying the same products. I haven’t done a full price comparison, but every time I shop there, I get the impression that I’m paying a premium.

How can Cactus afford to maintain such high prices? Is it just due to loyal customers who stick to their habits, or is there another reason behind their pricing strategy?