sdjf wrote:I thought there still was a maximum power that the Pi would deliver of 100mA through each of it's USB ports. Isn't that still true? ...
The original Pi had a poly-fuse in line with each USB socket, severely limiting the current available for devices. Later revisions removed those poly-fuses, so that the current limit is more relaxed on those.
There's still the input poly-fuse, so powering normally, you can't provide much current to devices.
But feeding power through the GPIO pins bypasses that poly-fuse, so you could use a non-powered hub with that should probably work.
The ideal is to use a powered hub and back-feed the Pi from it.