There is this famous quote in Real estate industry.

100 people, 50 drop out.
30 barely make ends meet
18 did above average
2 made it big.

I think 50-100k PA is average.
Seems a lot right? But must remember to minus expenses, advertisement, petrol, car all these.. And also work 7 days a week, on the go kind of job. No MC, no CPF, no benefits, no bonus, no security.

End up, you may not have much left.

Worth trying. But if you can't hit 150k PA and above, better leave fast and find a stable job.