Because I want a tiny, polished, Nintendo box. I also have a Pi, which requires a lot more faffing, configuring controllers in stacks of emulators, trying to set up shutdown scripts so you don’t kill the sdcard. Even buying 2 decent Buffalo SNES pads would be £40, the Pi would be £31, the case another fiver, another fiver for a 16gb SD card.
It’s probably the same reason people buy a £250 dropper post, when they’d get more adjustability, less weight, less cost, just by stopping and adjusting the QR 😛