Look at the real-world evidence: Ohio and Maryland ran cash-prize vaccine lotteries, and vaccination rates barely moved. That tells us payment is a weak lever, not a dependable one. The short-term bump in that randomized trial may just be novelty or convenience, not a lasting change. When the money stops, you're left with the exact same trust deficit you started with, or worse. Sustained vaccination coverage depends on people believing it's the right choice. If the only reason someone gets the shot is the cash, the behavior ends when the cash does.