wow! not to sure how you can claim that... I could flood the site with a mountain of academic research showing you claim is wrong...
eg https://www.msd.govt.nz/about-msd-and-our-work/publications-resources/monitoring/household-incomes/
Max Rashbrooke has written widely on the topic... Stats NZ has a ton of stats negating your claim... B Easton Vic uni has covered the topic in depth.. CTU's Bill Rosenberg covers it in
By Bill Rosenberg
A new study, “Shrinking portions to low and middle-income earners: Inequality in Wages and Self-Employment 1998-2015” shows rising inequality in the hourly rates of gross earnings (before tax and benefits) among both wage and salary earners and the self-employed over the period 1998-201
I've tried to post some graphs without luck..
And on top of all that the Tab has over the years spent a massive amount of time propagating bet types that have massive 'betting take outs'.. eg Quin 25% etc.. leading to less and less churn... sigh...