I don't think Lee would do great with his own supp company because he's came out so many times and said supps are worthless. The only supplement Lee's ever said he liked is egg protein powder. Maybe if somehow he could find someone to make a pure egg protein powder that actually mixed well and didn't taste like wet shit he could swing it.
That's funny!! Priest has stated (on GetBig) that he used and liked Prolab's products when he worked for them, further stating that the reason he left Prolab was due to the change in management and their lack of emphasis on bodybuilding (perhaps, that corresponded with a cut in salary; I don't know).
Furthermore, Priest currently works for Cutting Edge Labs and seems to be fond of NOX-Surge and ReFuel. Of course, he's paid to endorse that company's products. Then again, the only company (of which I'm aware) whose wares that he has publically disparaged has been that of MuscleTech.