To be honest- at this point BFL is a functioning company with R&D costs like any other. If this new revelation explains anything, I think it more likely explains why they needed to offer pre-orders: with a history of Mail Fraud it might be impossible for BFL to get outside venture capital, or even borrow money from the bank, thus the community pre-order's bankroll the next iteration of equipment.
Inaba stated that that preorders were not used to fund development and that outside investments (VC, etc) were taken.