There are uncountable, individual reasons for this behavior, but they seem to fall into several main categories.
One type is people who grew up in desperately poor circumstances and vow to reach financial security. But they keep moving their self-imposed goal posts, so that no amount of wealth will assuage their feelings of insecurity.
One type is people who grew up in desperately poor circumstances and vow to reach financial security. But they keep moving their self-imposed goal posts, so that no amount of wealth will assuage their feelings of insecurity.