I consider macaroni cheese as a "comfort food" - one of those things that's a perfect ratio of carbs and fat. But it's a very easy thing to make, even for a novice, in 20 minutes when you're taking your time. I remember my mother teaching me how to make it before going to university, the very first thing I'd ever cooked - I remember thinking, "wow, is that it?!".
And it's the sort of thing that is always going to be at least 2x better if you make it yourself, because you use actual cheese (sounds so weird saying that as a Brit!), as mature as you like, and as much as you like.
I'm very obviously not the target market now, but even as a cash and time-strapped student a lifetime ago, whose mum had tought him cooking basics just few months previously, I still don't get how someone could make a fortune out of this ¯\_(ツ)_/¯