I think most people don't even think about where software comes from, I am a software engineer and if I find a product that I like and solves a pain for me and does it correctly , my first thought isn't "I could do this mnyself" , I buy it, more so if it is like 15-20 dollars. My time is more precious than spending 2 weeks makins sure whatever software I am clonign does the job better.

2 weeks of dev time is worth way more than 20$. So people buy to solve their problem faster and with less of a headache than they would themselves.