i've done the same thing on my G4 Cube a few years back,.. with 2 usb-hubs and 8 usb devices connected at the same time,...

I accidentally pulled the power plugs from the hubs, still, everything was working fine,.. untill not too long when doing just a little bit too much with usb powered devices,.. the usb-ports on my systemboard were burned trough.. wich cost me a lot... enough to simply get a new system..

I hope you haven't met the same fate, and just use the power supply of the hubs and not let your mac provide all the power and killing your mac in the process.

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