What? This isn't true at all. There are many many people earning this amount and as evidenced by this thread, some are highly qualified and others have just moved up, moved jobs or are in big companies with lots of responsibilities which warrants the salary. I disagree that you need to have a niche or that you have to be "chartered". Chartered what?
OP I earn close to this, I work in a small consulting firm, I have 20 years experience, I could earn more but I have no interest in taking on more stress.
I work around 40 hours a week, sometimes more if deadlines or things go wrong, often balanced by quieter periods.
I have no business qualifications just a degree. I am intelligent, academically and emotionally, proactive and easy to work with.
I worked very part time when my DC were little and took a few sabbaticals. This undoubtedly hindered my promotion prospects but doesn't bother me at all, I kept going and now earn well, I hope to have lots of options to move forward once DC have left home, had them relatively young so I won't be 50 at that point. Although the job market seems tough I do see people at my level / age moving about a lot.