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?
It's fair because it's a choice people make. If you earn $150k and are still penny pinching then perhaps you've extended yourselves too far. The person with only 50k and ni debt might look like they're on a good thing, bug what will they have in 50 years time? Prob not a lot.
Everyone has a choice and I get sick of people who say we earn $150k but have lots of bills, poor us. The fact is they are still earning 3 times as much as the person on 50k.