The article is about level of wealth, so in a sense a level 0 means "does not qualify as wealthy". I think the scale is fine on the lower end but agree it could

The article is about level of wealth, so in a sense a level 0 means "does not qualify as wealthy". I think the scale is fine on the lower end but agree it could go "higher". Although your example of level 4 takes into account some sort of ROI, which is not present in any other level.