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Exactly. USB is designed so that you can have multiple devices attached to one port. 7 slots on the PC is plenty.
And in fact, they probably already have a hub. I can’t remember the last monitor that I bought that didn’t have a couple USB ports on it. Put that thing to use. Webcam, USB headset/mic, keyboard and mouse can all run perfectly well off a monitor hub as can most other accessories. Save the direct ports on the mobo for things that need the bandwidth like storage devices.
Because shut up. /s
But really though, the entire concept of using humans as batteries is absurd. Don’t think too hard about it, just enjoy the movie.