BTO's ceiling for Singles is 7k and 14k for couples (thus 7k is the ceiling individually too).What talking you? Household income combined is not the same as individual income.
7k in current days is not a lot, unless you are ok with living a frugal life or if not, content with not having any saving for rainy days.
At the rate which GST, Medisave, Insurance premiums and other cost of living expenses begin to rise, I dare say not even 10k is a lot.