Top result on Google for how many km should running shoes last

Experts recommend you replace your running shoes every 500 to 750 kilometers. That's roughly every 300 to 500 miles, which equates to approximately four to six months for someone who runs 20 miles a week.

What are you doing replacing your shoes every 4 weeks?

What's your weekly mileage? Are you doing something extreme to your shoes? Most runners don't spend, nor could they afford to spend $250 per pair of shoes that wear out in 6 weeks. Try $100 every 6 months instead. Events do add up but for most runners it comes out to roughly the same as the shoes or less. Running is popular because it's affordable. You might be projecting your rarefied well funded lifestyle onto the rest of the market