Will the Qubes Team be sharing a portion of their commercial profit with members of the Open Source Community who have previously contributed to Qubes OS?
As one of the people who has contributed code to Qubes, I don't see why they should do that. I didn't contribute out of hope of financial gain, and I doubt anyone else did. They should use the money to pay for further developments on Qubes, not to pay for work already done and given away for free.