Other than what you have listed so far, some things off the top of my head:
1) Management consulting - spoke to someone in one of the B consulting group 3 months ago (either Bain or BCG, won't reveal). Was told that RM12K for entry level consultant is legit, but qualifications needed very high. First class honours from Oxbridge or high gpa degree from Ivy Leage, Stanford, Chicago, Northwestern, Duke.
2) Lawyers - small practice lawyers who have established a certain reputation and built a certain network can earn RM20K to RM30K by the age of 35.
3) Successful businessmen - there are folks between ages 25 to 35 who have a successful business with tens of employees and a million or two in yearly revenue. Assume that they can make 20% net profit off of their business - that's approximately RM20K a month for a business with RM1 million revenue per year.
4) Partners in successful professional services firms - accounting, engineering, medical clinics, pharmacies - can reach partnership by age 30 to 35, can earn RM20K per month.
5) Local lads and ladies stationed here by MNCs but with expat status - I know some folks working for Fortune 500 level corporations who are Malaysian born and bred, but studied overseas, and have been posted back to Malaysia as "expats". Their compensation package is in foreign currency, and they also get benefits and allowance tagged on. Manager level chap with staff of 10 under him pulls in RM20K easy. Country head at age of 35 - RM40K / month. Regional head at age of 38 - RM70K/month excluding allowances. Include allowances, and he is in RM100K/month club.
That's just Malaysia. Haven't talked about the big fishes of Singapore, Japan, Hong Kong, Europe, Canada and US yet. Or the biggest quiet fishes in China. Very tip of the iceberg stuff here lar.
you forgot aus/nz.