Pretext stops don’t generate ticketing revenue. They’re used in the hopes of finding more serious (by law anyway) crimes once they’re able to get a closer look.
3/4 end with warnings or no action. They’re not pursuing dangerous drivers or fines, they’re pursuing targets they think they can escalate to more serious charges (such as weed possession, in other states anyway)
Sure they do. They’re still getting the broken taillight fine after the cop searches the car.