What people earn has no bearing on how well off they are.
A couple earning 150k could have that much debt that they are struggling, where another couple on 50k could have zero debt and living quite happily on their 50k disposable income. I know some one in the latter situation, but she still gets Centrelink payments etc because technically she is classed as a low-middle income earner, but owns everything even her house. How is that fair?