S$6,000 a month pay means S$5,000 take home after deducting CPF contribution. You will not be poor with this monthly take home pay for 2 person but you will not have much left for savings.

Basic Expenses incl:
1. Housing rent/Utilities
2. Food/Entertainment
3. Public Transport or Car/Maintenance/Road Tax/Insurance
4. Insurance
5. Medical/Dental
6. Clothes/Shoes/other grooming expenses eg. hair treatments/facial/hair styling
7. Tax
8. Household items

Most Singaporeans with household income of five figure sum are not living the luxurious life. People living a luxurious life are able to do so from investment income/inheritance/accumulated wealth.