That's an awesome thread, thanks!

I read through the first ten, last ten and middle ten posts.

People are saying that the USB2.0 hubs start to fail after you plug in a varying number of devices, but none of them can power Block Erupters if all of their ports are populated with them.

They are saying that the USB3.0 hubs provide 12V 3A = 36W which is more than enough to power Erupters in every port, which is consistent with my testing.