Money actually can buy happiness down at the bottom of Maslow’s pyramid, but, as one moves up the levels, money’s ability to buy happiness falls off exponentially. If you’re hungry and need food, money can buy that. If you’re cold and need a warm coat, money can buy that. If you need social connection, money might help enable it to some extent, but any connection it can actually “buy” turns out to not really be the right kind of connection. If you’re looking for that hard to quantify “self-actualization”, there are plenty of people willing to take any amount of money to “help” you, but chances aren’t good at attaining it.

At least that’s the way I understand the need for the “necessarily” qualifier.