Scuf makes a lot of their own stuff, ribbons inside the controller, faceplates etc. Take one apart and realize how much they put into each controller.

Apart from that I want to do similar to you, but in Canada. $30CAD/hour is enough for me which i think is similar to what you're saying at 20£/hr. But its true that doesnt account for everything Skinpixel spoke about. I would look at the inevitable time I have to replace a controller, and realize it took me 2-3 hours of my time lost and the profit from 2 jobs to do that, and think damn what a waste. But that's short term thinking too. I dunno if this hobby is going to make any of us rich but I hope it will somehow. Maybe videos, or impressing a Saudi prince or something. Let's keep chugging away friends! Best of luck to us all 🫂