I do a lot of walking (always have), and even though I know you aren't supposed to do this, the vast majority of warm-weather walking I do is in flip flops. As a result, over the years, my feet got incredibly callused. Dry, chapped heels, the whole works. I think I also have a propensity to this, as my feet have always been kind of rough on the bottoms, unlike my husband's for example, which are usually pretty baby smooth.
The thing was, I tried to take better care of them but I just... didn't know how, I guess? Couldn't ever really get them to a reasonable level of "sightliness." So at one point years ago, it got so bad that I decided to get a pedicure for the first time in my life. I went once a month for a few months. I tipped well, too, because I knew my feet were a lot of work. But my larger plan was, I did this so that I could watch what they did so I could learn how to do it myself.
Fast forward to today: my feet, though not perfect, are now well-maintained. And no more money spent on pedicures, only on supplies to do it myself.