His jobs at Netflix is to get the best deal for Netflix, not to get the deal that nets him the most money from the vendor. The vendor paying him is increasing the costs to the vendor, therefore presumably increasing the costs they will pass on to Netflix.

The problem there is the money comes first. In the case of former regulators, by the time they are hired by the drug company they're no longer a regulator. It's not clear the drug company has anything to gain from hiring them. Yes it's grubby, but it's hard to prove anything. If the money comes up front, that's easy to prove.