Naively coming out of school, this slow realization that I would never be able to save any money by making cool gadgets was a bummer.
Except weirdly enough, basic home maintenance. I don't know what that says.
You could apply your logic to home building though. Builders get volume discounts on materials and labor. When someone is working the same repetitive job for months on dozens of homes, they can afford to charge their base hourly rate because they know their schedule will be full. If I built the exact same home the builder cranked out, it's going to cost me more despite using the same materials and people. When people build their own homes, they are usually going for something custom so a builder-grade starter home is not the goal.
Sometimes I don't want that headache and do the calculus of time & effort and spend the extra $ to get a speaker set that works with my phone :)
Wait until you get older and realize that if you want high quality, you have to drop down one-two levels on whatever you want to buy to avoid pointless shit like "Alexa" or "Google Home" integration.
Or you have to spend more to buy useful shit like alexa or google home.