I know we've went through this before, but you are not going to burn up the pc by plugging in 5v to the USB for an item sized for USB. It simply isn't going to happen unless the items are faulty. I can't speak to what you plugged into it (or maybe you have a different model pc?), but if it caused you to reboot, there's something else causing it. If the PC was lacking the power to power it from the USB, the item would simply flash on and off or not work at all. You aren't going to overheat the PC other than heat form lights in general...and again, if that's the case, you got bigger issues. I would actually guess that your issue was probably more related to a bug in the software at the time.
Pinstadiums? I doubt you would want to do that but I think those are 12v expected and more amps? I've never used them.
Now, all that being said, I'm not leaving my game on for 12 hours a day (although I did leave it on for 3 days straight for bug testing). I do not disagree that the proper way to do it is to pull from the PSU. I just think the FUD around the USB ports needs to be addressed.