I assure you that when Google set those bounties, they thought about how much they would have to pay white hats to make them do the right thing. Of course, it's

I assure you that when Google set those bounties, they thought about how much they would have to pay white hats to make them do the right thing. Of course, it's a highly illiquid market (usually there's just one seller and only a handful of buyers), and so the pricing is super inefficient (hence based on guidelines and not surveying on every individual bug), but the logic remains.