I suppose things aren't as expensive if you are a casual but I'm still surprised you can get 1k out of a pair of shoes. My mother also runs and is significantly lighter than myself and she gets shin splints if she doesn't change runners out at 500 miles. My current system is to run a pair of shoes for about 350 - 450 miles then downgrade them to a pair of walking shoes in till they fall apart.

I started running fairly casually but eventually started doing marathons. I run about 110 miles a month so I'm switching out shoes every 3 months. My feet suck so I'm also replacing a pair of orthotics every 2 years. I got a full set of summer and winter running gear and enough of each to last me a week. I also have a hydration vest, a GPS watch (not necessary but very useful), a set of Aftershokz bone conductive headphones so that I can listen to music while maintaining situational awareness, a pair of good sunglasses specifically for running (I sweat a lot and would not want to ware the same pair for everyday use), I have a few soft flasks that go in my hydration vest, and I've had to invest in a pretty decent treadmill to run on during the worst parts of winter.

Not everything I've listed is 100% necessary but as with most hobbies it finds ways to become expensive the more dedicated you are to it.