Numerology tends to treat 8 as its most worldly digit — the one most explicitly tied to money, position, and visible accomplishment, in contrast to more introspective neighbors like 7 or more relational ones like 6.
As a soul urge, that worldliness turns private: not a person's actual bank balance or job title, but their appetite for building toward one. A soul urge 8 can, in this framing, exist quietly inside someone early in their career, or someone who has deliberately chosen a modest life but still feels the pull.
The tradition is careful, at least in its more thoughtful corners, to separate this from simple greed — the want, as usually described, is for competence and impact recognized at scale, not money for its own sake, though the two get conflated often enough in casual writing.