8 tiers too many already. And at the highest end of asset above 100M, less than 100 people here in SG... not meaningful. How about looking at it as 5 groups here in SG. The poverty class, working class, middle class, middle upper classes and the elite/upper . Divide them as follows :

05 % Poverty class : Total family earning below $1200 per month. No net worth or negative net worth. need govt subsidies/welfare to make ends meet.
25 % Working class : Total family earning below $3000 per month. Little net worth or negative net worth. Ineligble for govt help. But probably get help from relatives.
50 % Middle class : Total family earning below $10000 per month. Some networth but all tied up in HDB. Would venture to say networth below $500K.
20 % Middle Upper class : Total family earning below $30000 per month. Networth btwn 500K-10M, Avg 50% of assets tied up in home.
<0.1% Elite : Total family earning above 1M per annum. Networth 10M and up. Less than 30% of assets in home. There are about 10,000 such households in SG.