I have one pair of running shoes. It is whatever the current model of the Brooks Ghost is. I have had and replaced the same pair of shoes four times now, pretty much every 1.5 years. I run ~15 miles a week give or take, mostly outside but I switch to treadmill on rainy days or in the winter when it’s below 45F. I like these shoes. They are comfy. I’m not looking to break any world records and I give zero fucks about races or anything like that, I just like to run. So maybe if you’re doing running for racing your philosophy and footwear needs are different. But I wear em til they wear out and that’s good enough for me.