I don't like defining "success" as some kind of bare minimum. Success is, at least, being better than average.
I think it's a fair measure of success to say that a successful person owns a house, has significant savings and a decent job. Perhaps a somewhat superficial success.
With this perspective, "success" can be better than average, which is what it is a lot of the times - most lotto players thinks winning the lotto is "success", and winning the lotto is by definition to achieve a financial outcome that is above the average of all financial outcomes that can occur from playing the lotto.
Can't feel safe, or the higher levels, if you don't have the money for food or medical care, etc.