The main argument I, and I believe the OP, was making is because the period of these programs are limited, and not even the full period is guaranteed as this shows, it affects how people act. If it's a program I believe I can count on existing for 10-20 years I can make significant life changes around receiving the money, eg move somewhere super cheap and volunteer or something, but at just a few I know I'm going to have to go back to normal at the end so making those big changes is harder.