Having money means you don’t have to be a complete wage slave. When you’re not afraid of getting fired, when you have means to get by if you’re out of a job, etc. you don’t have to submit to abusive bosses, and you never feel like you’re helpless and can’t leave the place you work.

With enough money, you may not need to work at all.

In a capitalist society, money buys a way out of the always looming menace of the reserve army of labour. Maybe not completely, unless you’re dirty rich, but enough to remove helpless serfdom and slave-like conditions from one’s life.